Flathead Gas Mileage

lesterwa58 said:
I am wondering if someone out there might have an idea as to how I can improve my gas mileage, I am getting like 4 miles to the gallon. Some background. I have a stock 59AB engine with two 94 carbs, that have no been touched, in a Model A roadster. There are no fuel leaks, there is not smoke and the exhaust pipes (2) are clean, and there is no smell of gas at any time whether I am moving or at an idle. I have an electric fuel pump, but the fuel runs through a pressure regulator set a about 2.5 pounds. I have let this engine idle while sitting on my concrete pad and there is no sign of any leaks, even when I get under the car and look. The compression ratio in each cylinder is about 125.
Any help I can get would be appreciated as this kind of low gas mileage really prevents me from driving this car any distance. if I go 25 miles I use 6 gallons of gas.
Thanks, Wes Jones, Cle Elum, WA
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Just lie about it like everybody else does. LOL
 
The only time I really checked the mileage was on the NE tour. I was getting 16 -18 MPG over that week end. That was with one functional carb on a Offy regular dual. The back carb was blocked during that run. It needed attention so I blocked it off to go on the run. It was a primary secondary set up. I have since rebuilt and re-jetted both carbs. The linkage is now true dual. All the idle problems I had before went away. I am now at 47 jets(Kenct's recommendation) and 3.5 PVs in both. Power and response is very good and the plugs look good. I have not done any mileage calulations with this setup yet but I think it will be somewhere around 14 -15.
 
I just put 200 miles on my almost bone stock 49 with V8 and overdrive going to the Washington State flathead reliability run and got slightly over 20mpg. I drove at a steady 65 mph. I do have headers and dual exhaust.
 
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