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George/Maine · 09-20-2010, 08:44 AM

Do you have a home made tank and how many gallons in tank.Drive it 50 miles and refill it.I have 265 mercury with 2 97s and 2.78 gears and get 18 to 20 mpg.Some times the tanks are made wrong and you can,t get a good reading.

09-20-2010, 08:44 AM	#5
George/Maine Senior Member Join Date: May 2010 Location: Mid coast Maine Posts: 1,878	Re: Flathead Gas Mileage Do you have a home made tank and how many gallons in tank.Drive it 50 miles and refill it.I have 265 mercury with 2 97s and 2.78 gears and get 18 to 20 mpg.Some times the tanks are made wrong and you can,t get a good reading.