Even with my mods, I average 28mpg. I put on 140 HWY miles a day at ~80mph. I think my gas mileage sucks.


F-Body drivers are: SMARTEST ON THE PLANET so Never drive faster than your guardian angel can fly.

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Yellow Green 96' z28, M6, LT4 Hot Cam kit, 58mm BBK TB with bypass, Pro Mag 1.6RR, Comp’s Hardened pushrods, Comp’s HE Lifters, Extreme duty timing set, Pacesetter Headers, Flowmaster cat-back/no Cats & 3” pipe, K&N CAI, 160 Stat, Vortech Elbow, March pulleys, LT4 KM, B&M ripper, NGK TR55's, MSD Blaster coil, BMR STB, Walpro 255, 4.10’s, PCMFORLESS tune.

 

Damn, 28mpg with a cam and 4:10 gears. I have a feeling that will never happen with my car

 

I must really need a tune up, i get 11MPG all city with short trips.

 

city and highway driving 250 with 4.11s in and 6speed Now all hwy i guess over 300 or close to it....

 

This is funny......

96 Z28 388 6.4L = Approx. 220/Tank (Fully Modded)

95 3.4L = Approx. 180/Tank (POS running like ****)

 

with a stock engine except for exhaust and cai i get 27 mpg on the freeway its crazy i know, but i drove plenty of long trips and its consistently 27

 

I've got 2.73's in my car. I get about 18 mpg and about 280 miles to a full tank. That's with 91/93 octane also.

 

Wow dude.... you need a serious tune up!

 

All highway 70 mph the entire trip it managed 28 mpg even with heads/cam stock gears and 6 spd... only down 2 mpg from bone stock! Now around town its maybe 10 and from home to work I average 22 with probably 25% stop and go traffic.

 

I get 25mpg [80% highway] and over 300 miles per tank. Alot better than the truck 16.4 mpg..

 

drove my 6 spd to n.c. from PA and got 37mpg..... cruising at 80ish....

 

In the 94 I get about 230 miles per tank, in the SS i got 30 MPG between Flagstaff and Gallup, 81 MPH with cruise on in 6th.

 

Truck with the LT4 gets an average of 14mpg about half and half city/hwy. LT1 TA gets about 18mpg city and about 24mpg hwy.

 

stock 97 ss m6 i was getting 33 mpg on the highway, 17-19 in town. Im running REALLY rich right now, so I am seeing about 8.5 mgp. I pray I can get above 13 with a good tune.

 

man you m6's get great mileage... I only get about 13.5 mpg. about 200 miles per tank.. with a gallon to spare... mix driving..