That 100lb for .1mpg is purely highway at 60mph.
In real world driving, with stop and go, hills, turning I found with fuel logs as little as 400 to 500 pounds can reduce fuel economy by pretty close to 1mpg.
In a car that only weighs 2500lb and gets 50mpg, 100lb would make a lot more of a difference.
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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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