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Old 07-27-2011, 01:26 PM   #40 (permalink)
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Originally Posted by Milwaukee View Post
To make clear. I put used oil in tank first then go to gas station and refill tank to FULL then drive for about 300 miles then go straight to gas station and refill tank FULL then calculate.
Fine, but then you've still added 2 or 3 gallons of oil to the fuel tank.
The oil is also burned as a fuel, so it should be taken into account.

If you added 2 gallons of oil, and later filled up with 20 gallons of fuel for say 200 miles, you didn't get 10 mpg.

You then used 22 gallons of fuels (oil + gas) for 200 miles - or 9.1 mpg.
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