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I did this experiment once.
I took gas about the time they stop producing the winter formulation, put it in a sealed container waited a month or 2 till virginia summer time temperatures had arrived then burned it. I was able to pickup +2mpg the 2 times I was able to run the experiment.
I was expecting there to be no difference.
I was running a normal tune on my camaro's carb at the time.
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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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