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Ford increased their fuel economy by changing up the standard options on the powerstrokes in 2008 (I think it was) to yeald 10% better fuel economy.
All they did was change the standard rear end gear from 3.73 to 3.55 and they added a 4 inch chin spoiler.
Try an air dam or chin spoiler and finding a rear end with taller gears than whats in there now.
An aero truck bed cap would really help too. You could pick up another 10% just form that.
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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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