i think you mean gpm....
Mpg question?
- Thread starter okie
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How is it possible that VW became this bad???I just got back from a 500 mile round trip journey. I got 12 mpg on all tanks except for the trip home. I had a 30-40 MPH tail wind the whole way home and got 15.5 mpg. 
Desmogged 2f, 3" lift and 33x9.5's in a '78 40.
Desmogged 2f, 3" lift and 33x9.5's in a '78 40.- Joined
- Mar 24, 2004
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I just drove from NC to CO (1800 miles) in a '78 FJ40 that I just purchased. It is bone stock with exception of new 33x10.50 BFG ATs and a 4 in susp lift. I got home last night, so this info is fresh. My speedo registered about 60mph most of the time while driving, but my GPS tells me that with the difference in tire size I was averaging 65-70 mph most of the way. I averaged 10-11 mpg. All in all I was happy that I had no probs and drove this baby that far in just 3 days.
i get 12.5 on the freeway
a 63' motor 1bbl carb, 30x 9.5, no pcv valve i need to get one and the mpg should go up.
a 63' motor 1bbl carb, 30x 9.5, no pcv valve i need to get one and the mpg should go up.
Last trip to Moab I got 13.5 going 75 the whole way up and over i70, well on the climbs it was floored. This is with an F, webber, and 35s swampers. So i'm guessing I could get around 15 on a flat lower elevation road going around 60-65
okie said:
He's running 35's. For every increase in tire diameter, theres a decrease in rpm. The problem lies with available power, his rig has enough to turn that big of a tire at freeway speeds.
I run 75 on flats regularly with a tired old F and 33's.
The rebuilt carb and late model factory electronic ignition with vac adv. helped greatly with high speed running. It has also improved over the time I have owned the truck. Used to barely run 55/60.
I have touched over 80 mph several times.
There is something about certain worn F's that lets them push high RPM's easily. Mark has said he had the same experience with one of his trucks as well.
I get 10mpg running WOT on the freeway. Worse than Bustantley cause of the RPM diff.
The rebuilt carb and late model factory electronic ignition with vac adv. helped greatly with high speed running. It has also improved over the time I have owned the truck. Used to barely run 55/60.
I have touched over 80 mph several times.
There is something about certain worn F's that lets them push high RPM's easily. Mark has said he had the same experience with one of his trucks as well.
I get 10mpg running WOT on the freeway. Worse than Bustantley cause of the RPM diff.