2007 m6 c6 z51
callaway honker, ARH, high flow cats, npp, tune 391 rwhp /388 tq -- 22 mpg

after cam 232/236 @.50 625/625 112 -- 431 rwhp / 408 tq -- 12.9 mpg

ive had the car since monday, filled up. drove 50 miles and im on 3/4 of a tank. so from the computer im going to get 200 miles a tank coming from 350.

is this a tune issue??? i commute about 25 miles a day city, maybe two stop lights average speeds 60s

 

something is up, I average between 19-21 city/hwy with a 235/239 cam and TF 220 heads, Fast intake with LSA injectors, same headers you have with NPP also and a Vararam. My car is a 2006 M6 Z51

 

probably just need to drive it more

 

thats what i was thinking... as well as showing a few ppl letting it idol longer then normal.. ill run it two full tanks and calculate the numbers then.. just kinda threw me for a loop!!! i like the numbers from the gain, hope ill get back up to 18-20s mpg!

 

I have a 2008 coupe MN6 with the following mods:
LG Pro Long Tube Headers with high flow catalytic converters, Vararam VR-SC1R, LG G6X3 Cam Kit, Spring kit, Push Rods, Cam Gear, ASP C5 Underdrive Pulley Kit, Milled Heads, LG Super Wire Kit, 410 gears with harden shafts. LG did the tune. I am making over 500 rwhp.

I get about 16-18 mpg in the city and about 25 MPG on the highway. I did a recent post showing I got 25.6 MPG driving just over 262 miles.

 

You have a TUNE issue! Trust ME! I installed XS Power headers, Ported MAF and a VARARAM.

My STOCK mileage was 25-26 mpg on a Conservative drive. After the mods,, I was only able to get 22-23.

I had Chuck at Corvettes Of Westchester tune the ECU and after his EXPERT TUNE,, I exceeded the factory MPG and the throttle response and power were friggen outstanding.

I got 28-29 MPG on the drive to the cruise in down in Bowling Green KY

You need a VE tune to get your mileage back.

Bill

 

i hear quite a bit about his tunes. i would be curious to people local in dallas to take ride in their car if any have the tune. please let me know!!