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I used e10 once, noticed a slight drop in economy but not huge one. Wasn't worth the effort as it's only available at Gull in the upper north island in NZ so retuning to suit wouldn't be worth while.
So yes, the 10% E does reduce the fuel BTU's but then E is more knock resistant so in theory you can try a little more timing.
So yes, the 10% E does reduce the fuel BTU's but then E is more knock resistant so in theory you can try a little more timing.