I just got the new flash last week. On my last tank of gas, I got 22.26 mpg. This was 95%highway driving. Prior to that, I averaged around 20.5 mpg (on the highway). I really haven't noticed any other differences.

ya gotta be shittin me....22 mpg....no friggin way. go back and check it again

I average 21-22 with the R flash and live in Wyoming. 80% highway driving 70 MPH

keep in mind your fuel trims get reset during the flashing process... leave them stabilize after a few weeks then check back

The car is relatively new and after reading all of the posts about the crappy mileage, I am as surprised as you are. I got 307.5 miles out of the tank and when I filled it up, it took 13.812 gallons. Looks like 22.26 mpg. The Mustang GT Vert I just sold got between 23 - 24 mpg on the same stretch of highway. It's engine was almost 4 times as big, so the mileage doesn't look that great to me. It didn't need premium either.

The car is relatively new and after reading all of the posts about the crappy mileage, I am as surprised as you are. I got 307.5 miles out of the tank and when I filled it up, it took 13.812 gallons. Looks like 22.26 mpg. The Mustang GT Vert I just sold got between 23 - 24 mpg on the same stretch of highway. It's engine was almost 4 times as big, so the mileage doesn't look that great to me. It didn't need premium either.

according to the manual, the rx8 doesn't need premium either :p

I just got 252 miles on 10.003 gallons (and it spilled out of the nozzle)

I still have the M flash. should I get the latest? car seems to run ok but mileage sucks,would the update help?

I still have the M flash. should I get the latest? car seems to run ok but mileage sucks,would the update help?
You'll have to get R when you take your car in for the recall, so just wait it out.

My last fill and I'm not sure what flash I'm on was 13.23 gal and I was at 266 miles. 20.01 MPG and I drive the shit out of my car.

damn you guys, i only get about 170 miles out of a tank of gas...though that's with all stop-and-go driving and high revs every shift.

I still have the M flash. should I get the latest? car seems to run ok but mileage sucks,would the update help?

I just got the R flash and I had the M before. Bottom line: "DON'T GET IT!!!"

Mileage SUCKS now!! I used to get 20-21 MPG... now even with 90% HWY I am barely getting 18.5MPG!!!

I tend to be below 3750 RPM on 6th gear so the secondary port doesn't kick in and still mileage SUCKS.

On top of this $3.19/gallon is not helping! Guess I'll start using 87 octane from now on... My wallet is definitely suffering... "Thank you Mr. Bush!!"

Carlos

Interesting. I'm on the M flash and getting barely 20 mpg with all highway driving. Anything involving stop and go driving drops me to 18 or lower. Seems like there isn't a lot of consistancy between what happens when you get your ECU flashed.

im on N i cant break 16 mpg if my life. I did break it comming from disney at 74 miles per hour with cruise on , i only got 18 mpg :mad: when i had k or l i was getting 19s city and highway and 22 with cruise controll

Looks like it depends on the driver and how lucky you are to find a flash your car likes the best