What gear? what tranny? if Auto, does it have a shift kit?

 

3.23:1 or 3.32:1 i believe. numberdummy looked it up for me once. 70 mph is about 2800 rpms and 60 is about 2400 rpms. c6. no, no shift kit. umm stock tires. p275 or p245/75/r15 or something

 

Damn, them some high gears. I can see them getting better mileage then my 4.11, what tire size?

 

I had a '72 F250 camper special 4x2. Got 10mpg period. Loaded, unloaded, uphill, downhill. headwind or tailwind. Didn't seem to make a difference. Loved that truck. Dan.

 

my 1970 f250 4x4 360 with 4 speed gets 10.

aint gonna get no better.

my uncle owned it before me, it's been in our family since around 73.

he says the same, 10, never better.

the truck has around 500,000 miles on it btw, been all over the damn place, still runnin too. it's my plow truck now.

 

Good info in this thread, cause I'm making a few changes to see if I can get a little more out of my 68 F100 360 2bbl C6 LWB.

I bought it in Tulsa a few weeks ago. Drove it back to east Tennessee, a little over 800 miles. For some reason known only to the powers that be, Ford put a 12 gal tank behind the seat, meaning i had to stop for gas and Mt. Dew every 100 - 125 miles. Most it ever heald was 10 gal. It got 12.5 mpg at 5 to 10 over the speed limit, 65 to 70 mph, at every fill-up but the first.

I have not checked it locally yet...

It loves the mountains btw

 

Boss, I don't think Ford installed 12 gallon tanks behind the seat.


John

 

Me either, John, till i bought this one. Had a few people locally confirm they had previously had them too. Its too small for the mpg, that for sure.

I've see a couple of retro fits online that mounts to the frame, but have not looked at them too close yet, not sure what they do about the filler cap.

Bob

 

Bob, I have been around these ol trucks all my life and never even heard of this. I would like to see a photo of it if you wouldn't mind.

You can load it in your garage or email it through my user profile.




John

 

OK, give me a cpl days...

 

I wasn't aware that people bought these trucks for the MPG....LOL...I'm officially changing it for my 67 to GPM.

I've got a 352 FE 3-speed and drove from Durant, OK to Decatur, TX...99 miles. I filled up in Durant and the tell-tell needle was sitting perfectly at 1/4 tank upon arrival in Decatur. Do the math....

But, then again, I didn't buy the truck for the fuel mileage...

 

I used to have a 71 f100 had the tank behind the seat. think it was 12 or 18 gallon in there somewhere

 

I think mine would get less if I put a larger fuel line on it.

The reason it gets 10 and not less is that the line will only let that much fuel through...

Maybe if I put a smaller line on it, it would get better mileage. HMMMMMMMMMMM......

 

I plan on swapping a 1989 5.0 efi engine and a 700r4(that's right) trans in my 1972 f250.
Let's see what happens.

 

my 70 4x4 with a bone stock 360, 4 speed 3.50 gears in the rear gets 14 mpg. I know how far I drive to work all week and top it off every week and do the math.