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Old 05-05-2010, 09:03 AM   #1 (permalink)
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Ford 360 MPG

So my bro in law has a 360 Ford 4x4 with 4:10 gears 4 speed granny that im thinking about getting from him. It needs some minor work to get it going, I want to keep the tire size around 33"
What would the estimated MPGs be? I want a Highway worthy rig that I can do some Mudding and light off roading. Long bed truck

So the big question is.. Im wanting to get up in the 15+ MPG range.
What is the estimated MPGs with the current setup?
How much MPG would I gain converting the gears to a different ratio? And what would the MPGs be if I converted to propane?
Transmission swap?

Cant find any of this info, I was looking for some charts on ratios but cant find any.
Thanks
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Old 05-05-2010, 09:08 AM   #2 (permalink)
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Not gonna happen. you have a big block with a trans that doesn't have OD.
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Old 05-05-2010, 09:10 AM   #3 (permalink)
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My experience:

69 F250 2WD - ANY CONDITION - towing, city, highway - 10 MPG
71 F250 4WD - ANY CONDITION - city, highway, 3000lbs of gravel in the bed, 2000 lbs of firewood - 10 MPG.

Both were NP435 and 4.10 gears.

good luck on getting better... My next attempt will be to swap intakes and carbs...
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Old 05-05-2010, 09:47 AM   #4 (permalink)
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Estimated based on my own 1971 F-250 4x4 with a stock 360 7-10 in town at 55mph highway about 10-12mpg.

Probably will gain something swapping gears how much I don't know.
Propane would likely go down hill from where you are at now
Transmission swap is bitch, probably easier to swap engines

Some things that are worth doing on a 360 are camshafts, clutched or electric fans, and working on the exhaust flow.
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Old 05-05-2010, 10:04 AM   #5 (permalink)
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From my experience with a 1969 f-100 2wd long bed with a 360 and a c4 automatic, around 10 MPG all the time whether it's got a load in the back, highway, city, towing whatever, didn't make much of a difference. always worked out to be right around 10 MPG.
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Old 05-05-2010, 12:08 PM   #6 (permalink)
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I hate to state the obvious but you don't drive that kind of truck for the milage.

The cost of any modifications required to gain a significant increase in milage would surely offset any potential fuel savings.
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Old 05-05-2010, 02:57 PM   #7 (permalink)
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My F100 4X4 with an NP435, 3.50:1 axles and 30-31" tires gets ~12.5 hiway, ~10 around town & 6-8 MPG off-road. It got about the same on 33" tires.
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Old 05-05-2010, 04:28 PM   #8 (permalink)
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Yea thanks guys, I know its not economical, but itís a cool rig. I was just trying to make some decisions based on the MPGs and if any mods would be worth justifying with fuel saving. Or just save the cash for a Engine swap for something more modern.
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Old 05-05-2010, 07:22 PM   #9 (permalink)
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Same Boat

I have an 89 F250 4X4,351W,C6 flatbed that averages around 6mpg! Also have a 76 F150 4x4,400M,NP435 that stays around 10mpg. And before I tore my 78 down to build my buggy I got about 12 with it having a 300/6. currently working on a 6.9 Diesel swap for the 76 so I can afford to drive it more.
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Old 05-05-2010, 08:18 PM   #10 (permalink)
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I have an 89 F250 4X4,351W,C6 flatbed that averages around 6mpg! Also have a 76 F150 4x4,400M,NP435 that stays around 10mpg. And before I tore my 78 down to build my buggy I got about 12 with it having a 300/6. currently working on a 6.9 Diesel swap for the 76 so I can afford to drive it more.
That '89 should be getting at least a little better than that, my '94 351/e4od/3.73/38's gets better city than that! and about 14 hwy w/od off.
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Old 05-05-2010, 09:03 PM   #11 (permalink)
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My old 72 F250 with 360, C6, 3.73 got 10 mpg +/-1. Not long before I sold it I had dual exhaust put on it. That really made a difference in the way it drove on the freeway. 65 mph didn't sound like it was laboring anymore. I never did check the mileage after that. If you want economy, it is gonna be in airflow and the carb/distributor tune. Put a small set of headers on it with reasonably sized free-flowing exhaust. Add to that a small 4 bbl or Motorcraft 2100, no matter what, just tune it. Same goes for distributor, what ever you use, tune the curve. I would think 13-14 could be had on the freeway if you keep your speed to 60 or less and have a sharp tune.
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Old 05-05-2010, 10:26 PM   #12 (permalink)
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Aside from tuneup work and electronic ignition, I wouldn't drop a nickel into an FE if looking for economy. Swap a 5.0/5.8 in it with an overdrive trans, fuel injection if possible. Mine got 8mpg, with a best of 11 on a 200mi trip, 75 F250 4wd 360 4bl, cam, headers, C6, 4.10s, 35" MTs. Now it gets a consistent 17.5mpg, just took a $3k swap to a cummins with an overdrive trans, worth every penny.
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Old 05-06-2010, 02:46 AM   #13 (permalink)
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With an FE you're prolly better off measuring in gph instead of mpg! I really don't think it matters if I'm doing 60 or sitting in the driveway, all I know is it burns up a tank of gas really freaking fast.
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Old 05-06-2010, 03:05 AM   #14 (permalink)
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No 360's here... But, I have a 1972 390 powered f250 4x4 sitting here that averages 18mpg. It never comes out of 3rd gear unless on the freeway, which is 4th gear at 55-60 mph. I have counted the tank ratio many times, and it does in fact average 18 miles per gallon. It's a really good old truck, I wish the cab was in better shape though.

Anyways... I know that post was irrelevant, but those old FE motors can do a good job when used in the correct manner. They never "REALLY" made good race engines...
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Old 05-06-2010, 06:56 AM   #15 (permalink)
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No 360's here... But, I have a 1972 390 powered f250 4x4 sitting here that averages 18mpg. It never comes out of 3rd gear unless on the freeway, which is 4th gear at 55-60 mph. I have counted the tank ratio many times, and it does in fact average 18 miles per gallon. It's a really good old truck, I wish the cab was in better shape though.

Anyways... I know that post was irrelevant, but those old FE motors can do a good job when used in the correct manner. They never "REALLY" made good race engines...
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Old 05-06-2010, 05:34 PM   #16 (permalink)
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x2, either you're full of shit or can't do simple math.
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Old 05-06-2010, 08:42 PM   #17 (permalink)
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x2, either you're full of shit or can't do simple math.
x3... you are lucky to get 18 on a brand new truck.... totally full of shit....

1.8 mpg would be a closer estimate with that setup
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Old 05-06-2010, 08:47 PM   #18 (permalink)
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Ha Ha I had a 74 F-100 with a 360 2bbl. Those engines are factory retarded 4degrees for smog. I changed timing gear and chain set to a Cloyes set (straight up), recurved the dizzy, installed dual exhausts (turbo mufflers and 2.5 pipes). Picked up a couple MPG. From 10 to about 13/14 on the road. Later found a 4bbl intake and carb and installed it, gained 1 MPG if I was disciplned and stayed within the speed limit. You can pull down mid teen numbers with an FE engine if you do it right.

I have heard of FE engines in cars getting better mileage, but they were running gears that would be worthless in a truck.

Last edited by just4cuz; 05-06-2010 at 08:48 PM.
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