100112 ...... 17.5 to 19.8
100717 ...... 16 to 25
100804 ...... 20 to 21
100849 ...... 17.5 to 23.3
100879 ...... 18 to 20
101058 ...... 18 to 21
101083 ...... 15 to 19 (10% highway)
101145 ...... 13 to 19
101212 ...... 21 to 22 (4600 miles-80% Hwy,15% City,5% 9K rpm)
101365 ...... 13 <-- LOW
101450 ...... 15.3 to 19.3 (mostly city to 60% highway, normally around 17-18, just once above 18.4)
101604 ...... 15.9 average after 2400 miles
101897 ...... 16.7 mpg typically
102878 ...... I get 12-17 (85% city mostly, 6 mile work commute)
102035 ...... 19.5
102974 ...... 17 to 23...2500 miles
103130 ...... 13 to 15 <-- LOW
103727 ...... 17.8 to 22.2
103841....... 13-20.5 (13 is hard driving, 20.5 is purely highway)
104226 ...... 15 to 17 (city)
105069 ...... 16 to 20
105899 ...... 22 to 23
105730 ...... 17 to 22
106064 ...... 13-15 mpg 1,200 miles
106206 ...... 15 about 50/50 for highway/city.
106429 ...... 17.3 to 21.3
106454 ...... 17.5 to 21
106647 ...... 14.9 to 25.6
106908 ...... 15.3 to 20.1 (avg 17.7 mostly) only 1400 miles on it.
107891 ...... 14 to 17 <-- LOW
108417 ...... 18 to 20 mpg
108583 ...... 18.3 to 19.5
108837 ...... 14.28 - 22.58, lifetime avg=17.36
109058 ...... 16.5 to 22
109161 ...... 19 to 21
110311 ...... 17 (on first 2 tanks, very new car)
112585 ...... 21 - getting a consistent 21 mpg (combo of city & highway)
113952 ...... 20 {Predominanatly city-type driving}

 

has anyone taken into account air conditioner use? im not sure how much gas this wastes, but if you have the a/c running full blast in the socal heat, you have to be losing some MPG. im on my 2nd tank, getting approximately 15 mpg. vin # ends in 114xxx.

 

I'm amazed at how organized this thing is going. MPG is hard to trend and I applaud you for taking the initiative to try to figure out one. Keep up the good work and hope you guys find something from this!

 

That leads to an interesting possibility. As later VINS are sold in the fall and winter, less air conditioning will be used, hence higher mileage and a false trend?

Anyone here a statistician?

 

Thought you might like to see the spreadsheet.

PM me if you want to add/correct something. Since the graph is using average MPG, anything you can provide on that number is most important...for now anyway...

Hayseed, I've ace'd my stats courses, but, YUK! Besides, accounting for the use of AC? He he...right.

Y'all take what you see & really give it a large margin for error...say, 2 mpg maybe, for each car. Maybe more. I surely can't verify the accuracy of any numbers except for my own car. Differences in the duty of cars is HUGE. Like, mine doesn't even know what a mountain is yet... City/highway... AC useage... Transmission... Total miles/break-in... Hard driving habits... Soon a lot of us will have some really cold morning start-ups, some (like me) not so much so...

edit: see the updated spreadsheet 10/23

 

Thanks - ptiemann
----------------------------------------------
15.15L/100km

is

15.53 mpg

(1 m = 1.60935 km, 1 G = 3.78541 l)

I'll add it to a new summary
----------------------------------------------

My VIN# is 101580 -> 15.53mpg - 80% City, 20% Hwy.

 

101431 - 18-20 mpg mainly highway driving at >70 mph.

 

Hey racer -

just realized that I didn't give you my trans. It's a manual 6 speed. Vin 112741

 

I just found this thread about ODO errors

If the ODO shows 10% more miles than you actually drove, then that means that your real mpg is 10% less :-(

There was also something about the speedometer showing a too high number, that's another story. I have to check on that too next time I see that cop's radar.

It's unclear if ALL RX-8s have the same mistake or only some.

-Peter

 

The error is not 10%, it's 1/10th of a mile every 5 or 7 miles. Assuming that is exact, thats 2% error - tops.

 

My VIN ends in 101393.

Gas Mileage ranges from 20-24 mpg (75% hwy to 100% Hwy)

One tank was all racetrack mileage at 12.5 mpg

 

I've updated the spreadsheet above, just a little while ago. Here's what the graph looks like now. (I'm gonna just edit/update these two posts instead of adding more. Trying to keep this thread to a tolerable size.)
Keep the info coming! Look at the spreadsheet for what it needs.

 

107719 - 15.9 mpg no matter what my driving style. City, Highway, combined, windows open, sunroof open, traction control turned "completely" off.

 

Got mine Aug 23rd. It's a Winning Blue AT with 1650 miles.

VIN 109104.

22+mpg with 80% hiway. My best was 24+mpg with 95% hiway.
I usually get about 20-21mpg with 50/50 hiway/city.

I always use the cruise control to keep me at the posted speed limit (because if I don't get another speeding ticket this year my first one gets dismissed).

 

Congrats to your willpower.. I wish I had it. I got 2 tickets (neither one speeding) in the past 12 months and it takes 18 months here for one to fall off.. I mean 18 months until I can go to traffic school again.

Problem is that traffic moves at 70 - 80 mph with the right lane "only" 70. I tried the cruise control, but it's just unbearable and not worth the fuel economy.

:-(

Last night doing ~80 mph I suddenly recognize a cop in a white Camaro pulled over to the side lights down, nobody recognized or slowed down.
In my mirror I see him merge onto the freeway, pass me and he pulled the guy in front of me over to the side.

Sigh.

 

01129 ; 21.1 MPG overall average - most recent tanks close to 22 with DSC usually totally off.

 

VIN 106438
6 Spd GT
Southern CA San Diego
Freeway fast in morning 80-90MPH
Stop and go return home 20-50MPH
AC on mostly return home
Bad driving habits for mpg
13MPG until 2000mi
Now 14-15mpg 4300 mi

Someone said after first oil change MPG gets better.
I am close to the 5000, so will find out.

Paul

 

you have 5k miles and you havent changed your oil yet? if you havent, i suggest you do so ASAP. i plan on changing the oil in my 8 at least every 2.5k

 

Hey guys, here's a new attempt to collect data, just in case you haven't seen yet. More questions, but that also means more info for all of us.

https://www.rx8club.com/showthread.p...threadid=13280

We should probably stop this thread here or merge them, dunno

-Peter

 

just adding to your spreadsheet...

6 spd
GT package

 

100112 ...... 17.5 to 19.8
100717 ...... 16 to 25
100804 ...... 20 to 21
100849 ...... 17.5 to 23.3
100879 ...... 18 to 20
101058 ...... 18 to 21
101083 ...... 15 to 19 (10% highway)
101145 ...... 13 to 19
101212 ...... 21 to 22 (4600 miles-80% Hwy,15% City,5% 9K rpm)
101365 ...... 13 <-- LOW
101450 ...... 15.3 to 19.3 (mostly city to 60% highway, normally around 17-18, just once above 18.4)
101604 ...... 15.9 average after 2400 miles
101897 ...... 16.7 mpg typically
102878 ...... I get 12-17 (85% city mostly, 6 mile work commute)
102035 ...... 19.5
102058 ...... 18 to 21 ... 5300 miles
102974 ...... 17 to 23...2500 miles
103130 ...... 13 to 15 <-- LOW
103727 ...... 17.8 to 22.2
103841....... 13-20.5 (13 is hard driving, 20.5 is purely highway)
104226 ...... 15 to 17 (city)
105069 ...... 16 to 20
105899 ...... 22 to 23
105730 ...... 17 to 22
106064 ...... 13-15 mpg 1,200 miles
106206 ...... 15 about 50/50 for highway/city.
106429 ...... 17.3 to 21.3
106454 ...... 17.5 to 21
106647 ...... 14.9 to 25.6
106908 ...... 15.3 to 20.1 (avg 17.7 mostly) only 1400 miles on it.
107891 ...... 14 to 17 <-- LOW
108417 ...... 18 to 20 mpg
108583 ...... 18.3 to 19.5
108837 ...... 14.28 - 22.58, lifetime avg=17.36
109058 ...... 16.5 to 22
109161 ...... 19 to 21
110311 ...... 17 (on first 2 tanks, very new car)
112585 ...... 21 - getting a consistent 21 mpg (combo of city & highway)
113952 ...... 20 {Predominanatly city-type driving}

 

For what it's worth and this may confuse ppl, but.....

I just filled it up now to recheck.

The first time I filled was around 1/2 tank and got 20mpg

Now i was at 1/4 tank (filled 11.7 gals) now i avg 16.3mpg..

I will admit a few things, i have driven it a tad bit harder and today I drove around for a short while with 4 ppl in the car....

i don't know....go figure.

 

It looks like the numbers are up or down no matter what the VIN is. I dont think build date has anything to do with it.

 

Here's the updated spreadsheet....

 

and the updated graph...