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If the BTU/mile was true my impala shouldn't brake 20 mpg on it, but averages close to 24.
Only tanks below 20 are due to the dash & gauges not working quite a bit during those tanks due to short in wires under the seat, I should delete those.
Same for the 2002 Suburan I had, tanks listed on fuelly, 35 tanks of E10 15.2 mpg, E85 should have barely made 10, yet 30 tanks of E85 averaged over 12.
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