MPG's for you auto vs manual guys, 350's only please.

[Silentkillzr]

Looking for numbers mainly on 5 speed guys. Looking at some 5 speed z71s with 350's, I drive mainly hwy with a little bit of city. Auto numbers would be nice too.

 

[aaronb]

Well I have the 4l60e auto, with 40" rubber, 20x12's and 5.13's in the axles. I'm getting between 10 -12 mpg with a custom tune done by a local shop.

 

[heavychevy98]

17 mpg highway 15 city. Vortec 350 nv4500 3.73'sand factory rubber.

 

[SCOTTYINWV]

1989 tbi 350/.030 over rv cam. Getrag 5 speed on 245s with 3:73s

13-16

There is also a fuel mileage thread on here.

 

[racer36]

Auto comparison for ya. I get 13-15, country roads daily driving. Has vortec 350 with all tbi mods, custom intake and 3" exhaust without cats, 3.73s and 33" tires. Tune soon to get rid of the codes for o2 sensors

 

[slippy3002]

94 K1500 Z71
5.7 TBI Stock
3.73
NV3500 5spd
15-16 Smiles Per Gallon Average.

 

[poncho62]

97 350/auto/3.73s/stock tires.....15-16....less in the cold weather it seems

 

[SCOTTYINWV]

The less mpgs in colder weather is due to winter blend fuel

 

[96Z71ECSB]

'96 5.7L Vortec, Z71, 4L60E, 3.73 G80, 2.25" duals with dual in/dual out 50 series flowmaster, 265/75-16 mild all terrains in the summer, snows in the winter.

I get 16mpg in the summer (A/C on) and less in the winter. I get 11 to 12mpg (no overdrive) towing 5000 to 6000lbs.

By the way, I do not go slow. I push my truck hard.

 

[aarolar]

The less mpgs in colder weather is due to winter blend fuel

Even with the same fuel colder air is denser meaning more air into the engine which equals more fuel needed but the winter blend exaggerates it even more.