Re: 1930 Sport Coupe 11 MPG, backfire when turned off
Use google maps to verify your speedometer is accurate. If the odometer off, your mileage would be off the same percentage. My A only gets 12-14 mpg, fresh motor standard head, 3.54 rear end, 16 inch tires, no Mitchell/etc, spark plugs read good, running a zenith.
If the plugs read good, and motor is OK, not much you can do with what you have.
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