The little test kits with the graduated syringe or the vile that you mix the fuel sample with water are pretty accurate. The new law just signed last week allows 0-15% ethanol for road use with a sticker on the pump. When the limit was 10%, we used to sample fuel all the time. A class project was for students to bring 9 fuel samples from 3 different gas stations. Then we would test them. This would give us a couple hundred different samples in a typical test. We would use the home test, (water method) and the electronic tester sold through Kent Moore/SPX to GM. Results were all over the place. From 0% alcohol to a high of 13.5% the last time we tested which was a year ago. With the limit now raised to 15%, I wouldn't be the least bit surprised to see 17%-18% out there. Your lawnmower won't like that stuff.
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