| len47merc | -- 03-15-2015 @ 7:13 PM |
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Am interested to know what fuel mileage expectations should be (city/hwy) or mileage typically is for stock V8s with 3.78 rear gears and no OD units. Info specific to 59ABs with 3.78 gears, no OD, is very much appreciated (not aware whether fuel mileage variances between V8 models are significant or not). Steve
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| Old Henry | -- 03-15-2015 @ 8:08 PM |
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I get 15 mpg highway. Haven't checked city mpg.
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| Drbrown | -- 03-15-2015 @ 8:56 PM |
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100hp 59AB, 3.78 diff, 15" wheels, coker radials, stock V8 with electronic ignition: HIGHWAY = 15 mpg (steady 55-60 mph; level/gentle terrain; 70 to 85 degrees; 87 octane 10% corn gas) .... OD raises mpg to abt 20. CITY mpg = abt 11-12 mpg under same conditions, no OD. This message was edited by Drbrown on 3-15-15 @ 8:58 PM
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| ken ct. | -- 03-16-2015 @ 5:01 AM |
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Guys above are about on the money,their not great gas savers around town are these flatheads. Have a good time. ken ct.
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| TomO | -- 03-16-2015 @ 7:52 AM |
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Steve, 15MPG at speeds up to 55 MPh are typical. Above those speeds it will drop. Around town, I get about 12 MPG. I live in a busy Chicago suburb, so you may do better. There doesn't appear to be much difference between the 3.54 and 3.75 ratios as far as mileage. I get about 17 MPG if I drive around 45-50 MPH, above that the wind likes to suck gas out of the tank. Tom
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| len47merc | -- 03-16-2015 @ 9:16 AM |
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Thanks guys - 15 is where I am at as well at steady 55 mph (gps) hwy speeds (~2,500 rpm) with a 3.78. A local occasional flathead re-builder who I have not used was 'strongly' advising me my '47 (Merc/original Ford 59AB) should be getting 20-22 mpg (without OD) @ those speeds. Given the plugs are burning medium gray, the exhaust pipe the same, and the car is running well, it has been a struggle to believe him and I wanted to get input from you trusted and experienced sources here on our forum. Thanks again to you all for responding and putting this to rest - Steve This message was edited by len47merc on 3-16-15 @ 9:17 AM
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| trjford8 | -- 03-16-2015 @ 6:57 PM |
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20-22mpg on a flathead is coasting downhill in overdrive. I suspect that flatheads getting 16-18mpg when they were new was the top of the mark. This message was edited by trjford8 on 3-16-15 @ 7:00 PM
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| Drbrown | -- 03-17-2015 @ 7:36 PM |
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I'm thinking the leaded gas in those times may have provided slightly higher mileage.
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| TomO | -- 03-18-2015 @ 9:58 AM |
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The ethanol and other chemicals to improve air quality reduce gas mileage about 10%. Tom
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