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Usually the extra mgp isn't worth the extra money. When I got the cobalt 2 years ago I used E0 to try for big numbers, 2 years ago same time of year 44.99 3-tank, last 3 tank on E10 was 43.7. I think the is pretty close to normal. I think there is a 3% energy content difference so it would be normal to expect that difference.
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