What are you inline 6 GM truck guys get for MPG!!

I just had a thought because I might have a deal working on a 50 GMC all stock in good working order and I am in the need of a DD while my car is down...

So what you guys get for mpg and is your in line set up??

-COS

 

Before I sold my '59 I was getting mid teens around town. The year I drove it to the HAMB drags I got around 20 on that trip. Of course that was with a 4 speed and a better geared rear.

 

mid teens, but haven't put any highway miles on it. And the overdrive is still in pieces on the workbench.

 

farm truck '59 chevy was 6-8. empty or loaded. 3.90 gears. 4 speed. and 100K+ miles.

 

damn, there's a knob on the dash that says C that you need to push in after it gets warmed up.

 

I've got the 235 chev engine (which is basically the same thing right?) in a car. I get 12-14 on the highway with a 3.55 rear gear and about 20 around town (weird huh?).

 

Thanks for all your input... So would you say low 20's is out of the question???

-Cos

 

What kind of RPM s do you run on the highway?
I have a 250 in a chevy P30 bread truck.
If it can go 3000 RPM then it will go about 60 MPH.
It is not ready for a road trip just yet.
Just hoping to get an idea of what I can expect.
Mike

 

Pushing a barn door like that down the road 8-12 at 60. Maybe a bit more.

 

Thanks,
That is about what I expect.
Mike

 

My '53 has a 261, T5 and 3:55 gears, speedo is correct, and I get 22 mpg if I run between 60-65 mph on the interstate.

 

54 belair with a 235, 700r4 3.73 rear, and getting mid 20's on the freeway @ 70

 

notice the guys getting any mileage have final gear ratios around 2.70

 

well mines a car but sedan deliveries had the same three speed and 4.11:1 ratio as trucks of the era, and i get around 20. but only if i keep it under 40