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With the Cobalt I had back to back tanks of 40.01 in July with E30, so 57 mpg petro. 37-38 mpg with E50, 74 mpg petro.
From the data I found in the past. E10 has 96.4% of E0's btu's . E30 89.3, E50 82.5 & E85 71.6. Assuming 45 mpg of E0 is still a good, E30 per energy calculates to 40.1 mpg, E50 37.1 mpg.
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