I've been spending a lot of time researching powertrain routes, and I've come to find there are just so many variables it's ridiculous to find anything real concrete of what to expect, especially when you factor in the shape of our trucks with gas mileage.

So I though it would a good idea to have an information bank of "real world" numbers to help get a better idea of what to expect from any option in our trucks to help take a lot of the guess work out. There is a lot of information out there, but it's very difficult to find out what you would expect to see from from your truck from an engine in a completely different vehicle. Aerodynamics can effect a lot. And a few MPG's might really mean a world of a difference to someone's route.


So, post what engine and transmission you're running and let us know what you've seen for gas mileage out of it in your truck (be sure to list your year of truck as well as they are shaped differently). And if there where any unique problems to using that set up. And your opinion of it if you'd like as well or any other information (the more the better). I think if we put it in a simple set up like below, it would help with having to read through a tremendous amount (I go through old posts a whole lot trying to find information and it takes a whole lot longer to sift through things when it's not easy to spot, thus I think it would be helpful to anyone in the future doing a search):



1. Engine
2. Transmission
3. Gas mileage (city/highway)
4. Year of truck

And then anything else you'd like to add. ^_^

 

F1 with a mild sbc, t5 five speed overdrive, 3.55 rear axle and 28" tall rear tires. A tick under 16 mpg with the stock 1406 edelbrock carb. I live at over 6000 ft and just leaned the carb one step but haven't checked mpg since the change. That mpg is a mix of driving without regard to mileage.

 

Been done a couple of times, maybe you can add these to a database?

https://www.ford-trucks.com/forums/4...s-mileage.html

https://www.ford-trucks.com/forums/3...o-you-get.html

 

How I spent so much time searching and missed those is beyond me... Lol
Thanks for the links, I can use them lol

 

5.9 Cummins out of a 94 f700, fuller 5306 6sp 3.31 ratio 37in tires

56 f600 9500# avg 18mpg

 

I am lining up all the parts for a T5 trans swap, so a little insight I can provide. I'll take a full tank before and give you the miles/gallons method for both a stock T8 crash box and a T5 - though it will take some time. (I just got my 225/75/16 shoes on and accurized the speedometer & odometer, so no figures from before - sorry)

Stephen, if you'd like to share the data when it gets to a postable thuroughness, I'd be happy to format it up in a nice chart and post here/ host it on my www space.

 

My 289 with a C-4 attached to a 9" rear with 3.0 gears usually got 17-18 on the freeway if I could keep my foot out of it. Jag

 

Previous configuration:
1956 F100
1964 289 w/ Holley 4bbl and Edelbrock performer 289 manifold
1964 C-4 trans
1965 HD 9" differential w/ 3.0:1 gears

16 mpg @ 65 mph with 275/50-15 rear tires

Hoping to at least match that with the addition of Edelbrock heads and cam and going from a 26" diameter tire to a 28" diameter tire.

 

53 F100

Mercedes 5 cylinder turbo diesel/auto

3:27 rear gears

255/70R15 rear tires

Average around 23 MPG in general running around.

 

51 F1

Lt1 TPI C---Y

700R4

327 gears

285x65R16 TIRES

21-23 MPG

 

55 F100
460
C6

3.55 rear

315x35x20 tires, 28.68 tall, 2500rpm at 60

About 5mpg!

Sam

 

53 f100 , flathead , 3.92 rear gears , t89 four gear , p235 75 15 when last running , mileage ............. it sucks lot's 'o' dead dino's !!!!!!!!!!!!!!! best i ever got was in town at 8.5 mpg ........ i'll bet the eco freaks and green peacers are rolling over in fear , and loathing me right now

 

Still better mileage than the 351w new from Ford in '84 F150 4x4 (real word was 8.0).....

 

5mpg out of a 460? Damn, I was hoping someone would get at least 10 out of theirs, lol.

I'm going to have to figure something out to be able to actually use my truck as a daily driver.

Keep em coming, I check the other two topics last night and after the second page they pretty much stopped with any such input and became debates :\

 

A girlfriend of mine had a 460 in a LTD - she got 6.7 (auto) out of hers back in the early 90's.... While she was a teenager at the time, she drove like a granny.