Thread: Full tank vs. Partial fill ups for Fuel Economy
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Old 06-22-2011, 09:54 PM   #12 (permalink)
California98Civic
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Join Date: Mar 2011
Location: Coastal Southern California
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Black and Green - '98 Honda Civic DX Coupe
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90 day: 66.42 mpg (US)

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Quote:
Originally Posted by Old Tele man View Post
...uh, water is 8.3 lbs/gal and gasoline is ~6.1-6.5 lbs/gal (depending upon the ethanol blend).
Yup. You're right. I saw a cite of 8lbs but that's wrong, apparently. Fueleconomy.gov claims 6.3lbs: How can 6 pounds of gasoline create 19 pounds of Carbon dioxide? That truth changes the math significantly but not the conclusion: there are measurable if marginal gains to less gas.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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