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Topped off the Cobalt this morning, calculated E66 blend. Put 10 miles after top off no CEL. Last tank with E55 somewhere between 39.8 indicated and 42.3 calculated, higher than expected, based on my E0 baseline of 45 mpg, E55 should have about 80% of the btu content and get 36 mpg.
Previous tank was same blend and 36 mpg, but also had quite a bit of AC usage so wasn't typical driving.
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