I heard biodiesel lacks BTUs A Btu improver might help.I run Power Service my mileage is 29 to 30.However I have 215 70 14 back tires,and 205s up front,so my car sits higher in the rear.
Helps with the wind.Best interstate mileage is 32.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt