I have consistently used non-ethanol "E0" gasoline this summer and run several tankfuls down to the beep and flashing-last-pip before refueling (500-600 miles). At each refueling I reset the correction factor used by the Scangauge to estimate fuel consumption based on the fuel-injector information coming from the Prius's ECU. The Scanguage correction factor that works most accurately for E0 fuel is 6.3%. Based on previous experience with 10% ethanol E10 fuel, the Scanguage correction factor for that fuel is more like 10-12%. Do these correction factors agree with other Scanguage users? Under the "trips" menu in the Scanguage II is a "tank to empty" parameter, which I have checked at exactly the time I get the beep and flashing-last-pip low fuel warning. With the E0 fuel and a correction factor of 6.3%, the "tank to empty" estimate at time of beep is 2.5-2.6 gallons, which is noticeably higher than Bob Wilsons's estimate of 2.1 gallons using E10 fuel when run to empty. Has anyone else used either the Scanguage "tank to empty " approach or Bob Wilson's fuel exhaustion approach to estimate actual fuel remaining for E0 fuel at the time of the low-fuel warning beep? Trying to get the Scangauge fuel consumption accurately calibrated so thanks in advance for your help!