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You are the only one I've ever heard on here saying year long test are best.
Everyone one else preaches ABA. ABA with a factory gauge the same day would be a good way to do it. But could only do a AB test one day without burning a lot of gas. With the car almost empty and fully warmed up find a nice spot of road, make 2-3 back and forth runs, recording average mpg each run. Then go put in 5 gallons of the second blend of gas. Even better if you get someone else to either pump the gas so it's a blind test.
BabyDiesel your SG2 won't be accurate so it wouldn't work for your escort, but Litesong could do it assuming he has a factory average MPG, and as well as I could with my Cobalts or Impala. Pretty easy and only take and hour or so, wish I had cruise control in my cobalt, maybe I'd use the Impala instead.
Raining and windy today and just filled up the Impala so can't today.
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