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After the first 4 tanks on my Prius I am finding that it registers almost exactly 5% high on every tank so far. One on 10% ethanol (10% worse gas mileage) and the other 3 on real gas. I had a J.C. Penny fuel mileage indicator in 1975 that allowed me to calibrate it by putting in actual gallons at the pump. Surprised that Toyota hasn't been able to replicate a 35 year old technology?
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