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Old 09-06-2012, 12:18 AM   #1 (permalink)
eco....something or other
Join Date: Jul 2009
Location: Colfax, WI
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wood hauler - '91 Ford F-250
Team Pontiac
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40 mph doubles mileage!

I tried driving at 40 mph on the last tank and took off real easy. I was just looking to see what would happen but was blown away by the results.

35+ mpg!!! In a 3/4 ton truck. This is double what I get if I drive normally. No aero mods at all except for folded mirrors. I would love to drive that slow everywhere, but folks get upset when they want to do 60+ and you are doing 40 and there is no passing for at least two miles.

I try to keep it around 45-50 most of the time. Theone thing that really gets me is the gears...1, 2, 3, 4, 5...still on the way to 45....I'm in 5th at 35.


1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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Old 09-06-2012, 04:56 AM   #2 (permalink)
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Yeah it works.
Aerodynamic drag starts to make up most of your fuel consumption on a large unaerodynamic vehicle like that above 40mph.
At 40mph a big truck like what we have should require about 6 to 7 hp to over come rolling resistance and closer to 7 hp to over come aerodynamic drag.
Then every time you 2x speed, your horsepower requirement to over come drag goes up by 8x.

1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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