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I would say grocery getter modding is still an acceptable way to test, when the operator doesnt know anything has changed. Our own bias to be able to put better number into the garage can skew everything, no matter how "scientific" we are trying to be.
My acetone tank went right back up to the tank when i bought the car that had acetone in it. Its still within deviation. I could have shut the engine down coasting a few more times and picked up 3mpg. The weather has warmed up as well.
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