Just did a 300 mile trip. Car is 95 Z-28 12 bolt rear with 3.73, CC306 cam, CNC heads, and all supporting mods did 19.22 mpg. Just cruised at 85 mph. Not to bad.

 

Not bad at all. With the m6 I got 25 still on all hiway miles when I had the 306.

Heads, bigger cam, heavier foot and its awful now.

 

routinely get 25-26 with my 233/233 cammed LS1....stock rear gears

 

That is good MPG.

 

Pffff, get your LS1 out of the LT1 section.

 

yeah, gotta love the 6 speed, my 306 gets 22-23 on the hw but i have stock gears

 

even with my 396 (4.10s, CC306, AFR195), driving half of the time in town, and having a lead foot i still get 15mpg. i still need to take the car on a long trip on the interstate...should get about 20mpg hopfully

 

I hate you all....trip to school and back (50mi total, all highway at 70mph 6th gear.) costs me 10 bux. not cool. which is why my car is sitting until it gets tuned.

 

On solid highway miles, I get 17 mpg. A mixture of city/highway is always 12 mpg.

 

Same here with mixed driving around 15, and if I beat on it maybe 8

 

12 town 17 highway, my a4 owns my gas

 

is this caused by the cam? or the gears? i'm looking into getting a cam, and right now i get about 15-16 town/highway mix. would mine drop down to 12-13 with a cam?

 

this is with the mods listing in the sig. new o2's new wires, plug, fuel filer, and opti. 3500 miles on the fuel pump. tune is good too. so i'm not sure if it could get any better.

 

I routinely get 220-240 miles per tank (although don't drive it much anymore) with a 306 cam, ported heads, full exhaust etc. Wonder if there could be more gotten outta this setup with a dynotune.

 

I get 25 highway with the GM847 and A4.

3.42 gears.