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Well its understandable to have a truck and not want truck fuel economy.
I was able to get as good or better fuel economy with my 1985 7.4L 3 speed with 4.11 rearend gears with, all engine mods, no aero dynamic mods. When I got it it was getting 6mpg in town, after mods I was getting 10 to 13 mpg in town and 16 to 18mpg on the highway.
There was room for more MPGs, using highway tires as it had AT tires, using more favorable gearing either an over drive transmission or numerically lower rear end gears like 3.73s, 3.42s, 3.21s or both and aero mods.
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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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