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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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