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Old 06-03-2008, 01:54 AM   #5 (permalink)
LostCause
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Join Date: Feb 2008
Location: California
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Thunderbird - '96 Ford Thunderbird
90 day: 27.75 mpg (US)
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The garage is meant as an aid, not a stage. It will still be useful if you can track changes in tank mileage, even if the numbers are not what you'd like. Ofcourse, personal preference is fine.

Excess MTF is going to sap energy from the engine due to increased viscosity. That energy has to go somewhere, which is generally heat. A lot of that heat gets absorbed into the engine block and sent out the radiator, but it probably increases the breakdown of the oil.

If you believe the engine will operate fine at 1.8l, you'll definately see a gain. To quantify that gain, do a towbar test at low speed to see differences in rolling resistance. Force scales are pretty cheap and it's easy to do.

- LostCause
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