Gas Mileage
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5th Wheeling
Joined: Sep 2020
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Gas Mileage
Hello All!
I have a 1967 Ford F600 Grain Truck that I bought from the original owner. I drive it only when I need to haul heavy things or building materials. I maybe have put 300 miles on it in the last two years I've owned it. Anyway, it has a 330 Y-Block that was rebuilt about 10 years ago, but with only about 3000 miles on the rebuild. It has a NP435 4-speed tranny and an Eaton 15000 Lb 2-speed axle. Looks like a new carb and ignition wiring, etc. I expected about 6 mpg for this truck. The thing runs beautifully, and I would drive it more, but it only gets about 3-4 mpg (with a tailwind)! Getting to the point where I cannot afford fuel for this thing. I probably should be using mid-grade fuel, but am using the cheapest stuff instead. Am thinking about adding a coil-driven tachometer to monitor rpm and find the best mileage, but will probably have me driving 40 mph on the freeway! Top speed on this is about 65. Short of a tune-up, proper air pressure in the tires, brake adjustment, cleared exhaust and all of the usual culprits (or replacing the rear end to better gearing), any ideas on improving gas mileage in this beast?
Thanks!
I have a 1967 Ford F600 Grain Truck that I bought from the original owner. I drive it only when I need to haul heavy things or building materials. I maybe have put 300 miles on it in the last two years I've owned it. Anyway, it has a 330 Y-Block that was rebuilt about 10 years ago, but with only about 3000 miles on the rebuild. It has a NP435 4-speed tranny and an Eaton 15000 Lb 2-speed axle. Looks like a new carb and ignition wiring, etc. I expected about 6 mpg for this truck. The thing runs beautifully, and I would drive it more, but it only gets about 3-4 mpg (with a tailwind)! Getting to the point where I cannot afford fuel for this thing. I probably should be using mid-grade fuel, but am using the cheapest stuff instead. Am thinking about adding a coil-driven tachometer to monitor rpm and find the best mileage, but will probably have me driving 40 mph on the freeway! Top speed on this is about 65. Short of a tune-up, proper air pressure in the tires, brake adjustment, cleared exhaust and all of the usual culprits (or replacing the rear end to better gearing), any ideas on improving gas mileage in this beast?
Thanks!
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The carb--Holley with a governor? Have you gone through it with a new properly sized power valve and adjusted the float level? Checked for worn and leaking needle and seat? Adjusted idle via vacuum and the adjusters?
My dad complained of 4 MPG out of the 292 in the '58 F600, but there was something wrong with the carb. His had a 4bbl that was always pig rich. A junkyard 2100 2bbl cleaned it right up after decades of black smoke....
My dad complained of 4 MPG out of the 292 in the '58 F600, but there was something wrong with the carb. His had a 4bbl that was always pig rich. A junkyard 2100 2bbl cleaned it right up after decades of black smoke....
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