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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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