Don't know if this is the right forum or not but.

I have a 2002 Z28 M6 with some bolt ons *headers* and 4.10 gears. My average fuel mileage is 22.1 MPG mostly cruising 60-65 MPH.

What gives??? Most LS1's with m6 get much better mileage.

Thanks.

 

That's not bad at all. You have 4.10 gears which don't help ya any either.

 

is that ALL highway, or is there some city driving in there?

 

I average 16 city and 26 highway with stock gears and the bolt-ons listed below.

 

Those gears are killing your mileage...

 

You complain? I have stock everything except catback and lid. I get 18mpg (about 50/50 highway/street). I'd figure I'd get better but guess not.

 

leaning out your A/F might improve it a tad,
but 22 mpg in a 350 rwhp car is something old hotrodders would have killed for...

 

I have found that your gas mileage will be directly proportional to foot pressure applied to the gas pedal.

 

Ahh, so THATS why I get 18 mpg

 

same here

 

I got 34mpg all highway with about 30-45 minutes of stop-and-go traffic.

 

No wonder the on board data thingy in the vette always goes down to 9mpg when I drive. Other than that all the vettes I've driving start at about 20mpg around town stock and right at 30 highway before I take the wheel. Dont know how that compares to a F-body.

 

i don't know how much i get to the mile but if i have a full tank it lasts from sun to th or fri and i drive at least 70 miles a day just got the car n i love it. lookin for another car to make it my daily driver

 

man i cant wait to pick up the hawk next week...in my R/T dakota i get......ready....brace yourself..... 10.1 mpg average....i put 45 bucks in my tank and my dte thing reads about 210-225 miles it seems like if i flog the shat outta it or if i baby it i get the same milage too

 

About 16mpg with a gear, big stall, and a heavy foot.

 

I have a 2002 WS6 M6 with a 4.10 and I average 18-19 mpg around town and
26-27 mpg on the highway.

 

If any of you have low temp thermostats installed; remove them and reinstall your OEM t-stat. Engines become more efficient the hotter they run up to a point of diminishing returns. I would want mine to run as hot as possible just below the threshold of detonation. Oil temps also come into play to. Low temp thermostats used in the way they are promoted in the late model stuff, is more of a jerry-rig to fool some sensors. It's not proper tuning.

 

if thats ur highway driving that is alittle low....i have MAC ML's, SLP lid w/ K&N, descreened MAF, LS6 intake, Custom Comp 224/224 .581/.581 112 LSA w/ 918's, MAC Y-pipe, random tech muff, MSD 8.5mm wires, B&M ripper(tuned of course)..... i get about 17-18 in the city...IF im drivin normal....and about 25-29 on the highway as long as i stay between 70 and 90

 

You're modding an already fast car into a real screamer....who really cares about gas mileage at that point? Performance doesn't mean good gas mileage anyway you cut it. I have a somewhat modded grand cherokee which gets about 12mpg if I'm gentle to it. I will be in Heaven with a somewhat modded z28 and getting 18-22 mpg...enjoy it!

 

Makes sense in a way. The hotter oil makes the engine run more smooth? hmmmmmm