What are some proven ways to get better fuel mileage? I've heard there are some intakes that can improve mileage, like the Rev-i. What about the other brands? How much of an improvement have you noticed? Also if you went with a larger diameter tire, lets say 245/45/18, would you get better mileage? Anyone try this? You would probably accelerate slower but a tenth or two might be worth it if you got another 2 mpg.

 

Constant speed driving has the biggest impact. Avoid traffic. Use highways.
My Catback system seems to have hurt my mileage a bit.
I have stock intake.
You can also take a board and screw it under your gas pedal.

 

Google "hypermiling." Then ask yourself if this is really what you bought an RX-8 for.

Ken

 

hypermiling, LOL.

 

That's after you screw a board under the gas pedal.

 

It is what it is. Sorry

Ever think about getting a Vornado or Turbonator?(Joke!)


I did that board under the gas peddal back in highschool The block came out within an hour

 

ride a bike

 

its called cruise control my friend, i cruise at 65 n im gettin 24 mpg

 

Ironcally, I always used to say that highway, cruise control miles yielded the best milage. However, i'm in a really odd situation now where the last 6 fill ups of in-town driving have been 18.5-19MPG but yet the last full tank on the highway was barely 21MPG.

The kick in the butt? I have finally started to leave the revs between 2.5-3.5 RPM's and run it up to 7-8K more frequently.

Don't ask. I have no idea. But honestly, that crappy highway MPG is starting to get to me. Why would it be like that?!

 

Always fill the 3 passenger seats with friends, family members or hobos. When traffic hits, turn off the engine and tell the passengers to get out and push.

 

but all those school zone tickets will cost about as much as filling up with normal driving

 

i read several posts where people have boosted their rx8s and noticed increased gas mileage i really dont see how that works out but id love to know

 

i have the revi intake and it doesn't affect my fuel consumption in any way. i averaged about 18 mpg before the revi and i still get the same after installing it.

 

Try this, https://www.rx8club.com/rx-8-discussion-3/no-more-detonation-%2Amiac%2A-121249/

Pre-mix also.

 

I've started towing my car with my truck.

It uses much less gas now.

 

I've noticed this too about the 8 which I find too be different than other vehicles. My 2000 Honda Prelude got 22 city and 27-29 highway which is pretty much what the EPA sticker had. I'm also getting 18-19 city and 20-21 highway in the RX-8. Was hoping to get more when getting on the highway, but I think you have to keep the revs lower (i.e. around 3k) which means slower highway cruising. I'm usually cruising around 70-80mph on the highway. Even though the Prelude and the RX-8 run at the same RPMs in top gear (4000 rpms at 80 mph), once you go past 3k in the rotary, I think the mileage really starts to drop.

 

but on the contrary, they were performing completely different cycles at that RPM. No doubt, that would be more harsh on the prelude's wear and tear!

and you are right about one thing...once you reach 3750, the secondary ports open which definetely will drop your milage.

Even more ironic yet, I cruise at 70MPH on highways, which reads 72MPH on the speedo (1.6 MPH slower then what it reads), and that sits at RIGHT about 3650-3700. I always figured that I was barely missing the point at which the port opens...but maybe not. hmm.

Glad to see someone else has similar city/HW situation then me tho!

 

the K & N drop in helps a very little bit. instead of getting like 19-20 highway, i get like 22-23 when Im not driving like a complete bat-out-of-hell.

 

So you're getting 2 to 3 mpg improvement with just a drop in filter? That's pretty good! Anyone else get the same results?

 

i am not advising for anyone to do this in any way, but on an episode of mythbusters on the discovery channel, they have proven drastic reduce in drag by 'tailgating' a big rig. i think they managed to save 30% off their normal fuel consumption by drafting the big rig within 5 feet, which is milliseconds of reaction time.

 

yea, its called drafting, and it works if you dont mind getting about 10000 miles worth of rock chips on your front bumper in about 10 seconds.

 

Watch mythbusters. +1 for drafting, if you don't care about your bumper or have a bra.

 

Drafting, and other tips are mentioned HERE

 

lol, why are you guys suggesting drafting!!! its all fun until people start break checking you!!!! But then you use your 238 hp to go around them and run away!!!

 

Sorry to break it to you like this dude, but if you're after fuel economy, you bought the wrong car!
However, if your low-fuel warning light has just come on, and it's 50 miles to the next service station, the following might help:
Don't use the engine to slow down. That's what the brakes are for.
Try not to use the brakes.
At 1000 RPM in 6th gear, you'll be doing 20 MPH. Always use the highest gear you can.
Accelerate slowly, if at all.
Lower speed=lower fuel consumption.
Try to keep a steady speed. (If you have cruise control, use it, except...)
When going downhill, put it in neutral or press firmly on the clutch.

Using these techniques in my previous car (Saab 93 SE Convertible 2L turbo) I averaged 33-34 MPG. Without these techniques, I got 28-30 MPG.
In my RX8, I usually get 24MPG. Using these techniques, I get 25MPG :o/