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I, too, am getting at least 10% better fuel economy. But I can't tell how much of that is because of the battery, and how much is from ditching the E10. There's no way to find out without reversing one of those. If it's the E10, then I can see no reason to use it. The 2 cents/litre saving is no saving at all, it's the opposite. If it's the battery, then why isn't this tech being pushed a lot harder?
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