Supposedly it can take up to 4,000 to 5,000 miles to break in tires to get normal gas milage.
Worn tires get the best mileage.
Seeing a 13% different is a little bit of a surprise. I would have guessed up to 10% max.
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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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