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Refilled today E27 netting 42 mpg on a car rated for 37. E10 tops out at 44-45 during the summer. E50 in the tank now, I'm guessing it will drop to 39.5. 2/3's BTU's says I should get 36.7.
Find out next week, dang, going to have non-typical driving this weekend so test won't be very valid.
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