No problem at all, E10 is recommended in the operators manual. I have a 2010 Prius and have run careful tests of the MPG over the last couple of years with 87 octane regular, 89 octane E10 and 90 octane premium gasoline. My BEST fuel economy is with a trusted high quality brand of E10.
The generation 3 Prius has an Atkinson cycle engine that runs a very high compression ratio (13/1) and can benifit from high octane fuel. If you can, buy from a station that has blender pumps, then you have a better chance that their E10 is a good quality 87 octane base stock with 10% Ethanol added. I have read that some cut rate outfits will use a poor quality gasoline stock and add Ethanol, sometimes in excess of 10%, until it meets the minimum 87 octane, not good stuff. Shop around for a store that has blender pumps and makes a quality product.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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