13 miles per gallon??!!
#126
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Re: Re: All hwy mileage report - still poor
Originally posted by msrecant
Are you considering contacting Mazda customer support (phone)with your MPG issue? If so, I would be interested in hearing what they have to say. I was not planning on even starting work on my MPG problem until I hit my 3K checkup.
Are you considering contacting Mazda customer support (phone)with your MPG issue? If so, I would be interested in hearing what they have to say. I was not planning on even starting work on my MPG problem until I hit my 3K checkup.
#127
We just got back from a trip from the DFW area to Chicago and back. Air was on all the time except for a few hours one morning. We averaged around 21 mpg. The best we got was a little over 22mpg when the air was off for about 1/2 tank. At least it's better than the 13 we've been getting in town.
I put in 1/2 quart of oil at 1300 and the other half at 2600 to keep the oil level light from coming on at high speed.
I put in 1/2 quart of oil at 1300 and the other half at 2600 to keep the oil level light from coming on at high speed.
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Re: All hwy mileage report - still poor
Originally posted by MVCalypso
... I don't want (or care about) steller MPG figures, I just want the car to operate as advertisedl... and I can honestly say that if the window sticker had said 13/19 (my averages) I never would have considered the 8.Dave
... I don't want (or care about) steller MPG figures, I just want the car to operate as advertisedl... and I can honestly say that if the window sticker had said 13/19 (my averages) I never would have considered the 8.Dave
#129
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Originally posted by jd62
I put in 1/2 quart of oil at 1300 and the other half at 2600 to keep the oil level light from coming on at high speed.
I put in 1/2 quart of oil at 1300 and the other half at 2600 to keep the oil level light from coming on at high speed.
#131
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Re: All hwy mileage report - still poor
Originally posted by MVCalypso
Both legs were run at the prevailing speed of traffic (which varied from 45 to 85 - I just went with the flow).
Both legs were run at the prevailing speed of traffic (which varied from 45 to 85 - I just went with the flow).
Remember, mileage at highway speeds drops off sharply above 60 MPH; the much-maligned 55 MPH speed limit wasn't chosen by throwing darts at the wall.
Run a tank on the highway at no more than the posted speed limit and see what you get...
#132
Originally posted by TJRX8
What is considered high speed that your oil light is coming on?
What is considered high speed that your oil light is coming on?
#133
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Originally posted by jd62
The oil level light came on at about 78 and went out after slowing to about 74. The level on the dipstick was about 1/3 down from full.
The oil level light came on at about 78 and went out after slowing to about 74. The level on the dipstick was about 1/3 down from full.
BTW I get it up to at least 80 everytime I take it out.
#134
Originally posted by TJRX8
I have about 1700 miles and just checked the oil again. It is right at half and I haven't added any yet nor has the oil light come on.
BTW I get it up to at least 80 everytime I take it out.
I have about 1700 miles and just checked the oil again. It is right at half and I haven't added any yet nor has the oil light come on.
BTW I get it up to at least 80 everytime I take it out.
#135
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Originally posted by jd62
I think the later VIN cars have better baffling in the oil pan. My VIN is 2178 build 6/3 and I think I have the old oil pan which causes the oil light problem.
I think the later VIN cars have better baffling in the oil pan. My VIN is 2178 build 6/3 and I think I have the old oil pan which causes the oil light problem.
![Confused](https://www.rx8club.com/images/smilies/confused.gif)
Anyway another fill-up today:
13.3 gallons and a whopping 214 combined miles traveled:
16.09 MPG and climbing
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
#136
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Re: Re: All hwy mileage report - still poor
Originally posted by BillK
You do
Remember, mileage at highway speeds drops off sharply above 60 MPH; the much-maligned 55 MPH speed limit wasn't chosen by throwing darts at the wall.
Run a tank on the highway at no more than the posted speed limit and see what you get...
You do
Remember, mileage at highway speeds drops off sharply above 60 MPH; the much-maligned 55 MPH speed limit wasn't chosen by throwing darts at the wall.
Run a tank on the highway at no more than the posted speed limit and see what you get...
#137
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Originally posted by TJRX8
10xx VIN and 5/28 build. hmmm now what?
Anyway another fill-up today:
13.3 gallons and a whopping 214 combined miles traveled:
16.09 MPG and climbing![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
10xx VIN and 5/28 build. hmmm now what?
![Confused](https://www.rx8club.com/images/smilies/confused.gif)
Anyway another fill-up today:
13.3 gallons and a whopping 214 combined miles traveled:
16.09 MPG and climbing
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
Last edited by RX-GR8; 08-29-2003 at 10:53 PM.
#138
Isn't it possible that the older cars in the first allocation that sat at port for a few weeks were flashed with different ECU settings than later production cars? Maybe Mazda has come up with new, "better" settings after having a little more time to test/tweak.
I just wonder if that would help explain the differences we're seeing in mileage figures. My car was built 6/23/03 and so far I have been getting 22-23 mpg consistently after 19 the first tank. I've been driving pretty aggressively the last couple tanks and my highway speeds vary anywhere from 60-80. My daily commute is 80/20 highway/city, and I've got a little over 1100 miles on the car now.
I just wonder if that would help explain the differences we're seeing in mileage figures. My car was built 6/23/03 and so far I have been getting 22-23 mpg consistently after 19 the first tank. I've been driving pretty aggressively the last couple tanks and my highway speeds vary anywhere from 60-80. My daily commute is 80/20 highway/city, and I've got a little over 1100 miles on the car now.
#139
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Originally posted by loco4rx8
Isn't it possible that the older cars in the first allocation that sat at port for a few weeks were flashed with different ECU settings than later production cars? Maybe Mazda has come up with new, "better" settings after having a little more time to test/tweak.
I just wonder if that would help explain the differences we're seeing in mileage figures. My car was built 6/23/03 and so far I have been getting 22-23 mpg consistently after 19 the first tank. I've been driving pretty aggressively the last couple tanks and my highway speeds vary anywhere from 60-80. My daily commute is 80/20 highway/city, and I've got a little over 1100 miles on the car now.
Isn't it possible that the older cars in the first allocation that sat at port for a few weeks were flashed with different ECU settings than later production cars? Maybe Mazda has come up with new, "better" settings after having a little more time to test/tweak.
I just wonder if that would help explain the differences we're seeing in mileage figures. My car was built 6/23/03 and so far I have been getting 22-23 mpg consistently after 19 the first tank. I've been driving pretty aggressively the last couple tanks and my highway speeds vary anywhere from 60-80. My daily commute is 80/20 highway/city, and I've got a little over 1100 miles on the car now.
#140
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Originally posted by RX-GR8
Also at 2,000 miles things seem to really get interesting around 6000 rpm in terms of power. Keep us posted.
Also at 2,000 miles things seem to really get interesting around 6000 rpm in terms of power. Keep us posted.
(btw, I have not been guilty of accusing people of inventing the 6250 power loss or not knowing how to drive. I wish those without the mileage or a/c problems would stop accusing those less fortunate of making this stuff up. It is really getting tiresome. This rant is not directed at RX-GR8, but many others in this forum.)
#141
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Originally posted by 8_wannabe
Interesting good or interesting bad? I've had crappy gas mileage up till now, but at 2000 miles seeing my mileage start to improve. I have NOT had that power loss above 6250 that some have reported. Please don't tell me I'm gonna start seeing a power loss!
(btw, I have not been guilty of accusing people of inventing the 6250 power loss or not knowing how to drive. I wish those without the mileage or a/c problems would stop accusing those less fortunate of making this stuff up. It is really getting tiresome. This rant is not directed at RX-GR8, but many others in this forum.)
Interesting good or interesting bad? I've had crappy gas mileage up till now, but at 2000 miles seeing my mileage start to improve. I have NOT had that power loss above 6250 that some have reported. Please don't tell me I'm gonna start seeing a power loss!
(btw, I have not been guilty of accusing people of inventing the 6250 power loss or not knowing how to drive. I wish those without the mileage or a/c problems would stop accusing those less fortunate of making this stuff up. It is really getting tiresome. This rant is not directed at RX-GR8, but many others in this forum.)
#142
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Originally posted by RX-GR8
Interesting good. Sorry I should have been more explicit. I read on this forum some owners stating that at about 2000 miles the power seemed to increase at 6200 rpm whereas before the port seemed to be stuck or there was hesitation..
Interesting good. Sorry I should have been more explicit. I read on this forum some owners stating that at about 2000 miles the power seemed to increase at 6200 rpm whereas before the port seemed to be stuck or there was hesitation..
#143
I am feeling your pain. I am keeping track on my latest fillup but its been awful so far. I've got about 500 miles on it and am beside myself on how bad the gas is. I would think the aluminum hood and pedals would push this thing to at least 40 mpg, don't you? Thats a joke.
Seriously, I demand at least 20. I will be gripping to the dealer too if I cant get it to at least 17. Below that is embarrassing, no matter how you drive. And I drive pretty conservatively.
I will look at the manual for the shift points though. But what fun is that. If I wanted some dang robotic shift points, I would have bought an automatic.
Seriously, I demand at least 20. I will be gripping to the dealer too if I cant get it to at least 17. Below that is embarrassing, no matter how you drive. And I drive pretty conservatively.
I will look at the manual for the shift points though. But what fun is that. If I wanted some dang robotic shift points, I would have bought an automatic.
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Originally posted by SPEEE DE
I will look at the manual for the shift points though. But what fun is that. If I wanted some dang robotic shift points, I would have bought an automatic.
I will look at the manual for the shift points though. But what fun is that. If I wanted some dang robotic shift points, I would have bought an automatic.
Now, I'm back to my old ways, but I've learned new bad habits (like efficient driving
![Wink](https://www.rx8club.com/images/smilies/wink.gif)
I am convinced that poor mileage has nothing to do with "bad" driving habits (within reason.) I've read many posts from people who regularly rev to 6K and are getting above 20 mpg without even trying. There are two versions of this car out there: Low mileage and high mileage. If I had to bet, it has to do with the ECU. I think we will get to the bottom of this, hopefully within the next few weeks (are you listening, Mazda?) because the polls on this forum show that more people are concerned about poor mileage than about less hp on paper. I would bet more cars will be returned for the mpg reason than for any other unless Mazda can help us sort this out.
#145
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yap
On the money 8_wannabe, as usual.
Gotsta be the ECU. Its the most plausible explanation, given the total confluence of info: the port hangup, the HP drop, and the drastic varation of MPG amongst different 8s. I wish knew how to check the firmware version. And, of course, I wish we knew how to flash it.
We creep closer and closer to October 1st, and Mazda continues to seemingly pretend this is not a problem. No recall. No TSB. Not even a quiet word to the dealers. They either don't understand the problem themselves, or they are living a fantasy that 8 owners don't really care about the MPG as much as this forum indicates they do, or they have already fixed the problem in new 8s, and are going to quietly let the buyback take care of the issue. I'm thinking its the later.
Since my car is one of the "sick" ones (and I don't mean "sick" in the newish positive form of the word . 13 MPG is the norm for my 8), I am leaning heavily in that direction. I will wait until the last week of September. If there is no fix at that time, my car is going back.
Great car. Lots of drama. This has to be one of the most fascinating new car experiences I've ever had. I am very happy to have the internet, and this forum. Think how screwed up all this would be if we couldn't communicate like this.
Gotsta be the ECU. Its the most plausible explanation, given the total confluence of info: the port hangup, the HP drop, and the drastic varation of MPG amongst different 8s. I wish knew how to check the firmware version. And, of course, I wish we knew how to flash it.
We creep closer and closer to October 1st, and Mazda continues to seemingly pretend this is not a problem. No recall. No TSB. Not even a quiet word to the dealers. They either don't understand the problem themselves, or they are living a fantasy that 8 owners don't really care about the MPG as much as this forum indicates they do, or they have already fixed the problem in new 8s, and are going to quietly let the buyback take care of the issue. I'm thinking its the later.
Since my car is one of the "sick" ones (and I don't mean "sick" in the newish positive form of the word . 13 MPG is the norm for my 8), I am leaning heavily in that direction. I will wait until the last week of September. If there is no fix at that time, my car is going back.
Great car. Lots of drama. This has to be one of the most fascinating new car experiences I've ever had. I am very happy to have the internet, and this forum. Think how screwed up all this would be if we couldn't communicate like this.
#146
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Re: Re: Re: All hwy mileage report - still poor
Originally posted by TJRX8
Posted speeds are 70-75, maybe that's my problem. I need to see if Jeb will lower the speed limits again! :D
Posted speeds are 70-75, maybe that's my problem. I need to see if Jeb will lower the speed limits again! :D
#147
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![Wink](https://www.rx8club.com/images/icons/icon12.gif)
I drive on highway about 60 % of the time at 70 - 90 mph, and in the city at normal speed. I accelerate quickly a lot of the time, and run the A/C in 90 + weather all the time. I have about 700 miles on the car and I have been getting about 200-mpg average each tank of 91 gas. Just giving the facts for me.
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
#149
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![Wink](https://www.rx8club.com/images/icons/icon12.gif)
So your getting what 12-14mpg, thats friggin terrible.
Last edited by mmjames; 09-01-2003 at 05:18 PM.
#150
So your getting what 12-14mpg, thats friggin terrible.
That may not be true. It depends how low he's letting the tank go. I also have a little over 700 on my car and have been filling up about every 200 miles (when the meter is around 1/4 mark).
200 miles--11.696 gallons = 17.09 MPG
220.1 miles--12.551 gallons = 17.53 MPG
200 miles--13.055 gallons = 15.32
The big drop was due to hitting 600 miles on the car and bouncing off the rev limiter frequently :D
Edit: The first tanks were not granny style driving. Reasonably hard acceleration but less than WOT and shifting just under 6K RPMs.
Last edited by red_rx8_red_int; 09-01-2003 at 05:15 PM.