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...is the OP remembering to "include" the quantity of diesel fuel being added into the gasoline in his "total" fuel used calculations?
...ironically, both gasoline and diesel fuel both have the same stoichiometric A/F (by weight) combustion ratios -- 14.7-to-1 -- although rather differing energy content values:
• gasoline = 114,000 BTU/gal
• ..diesel = 129,500 BTU/gal
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