Hey this is my first time submitting a question, but just wondered if any one knew if there is a big difference in gas mileage between an 79 F-250 and 350 4x4 standard cab my dad used to own a 76 ford that he made look more like a 79 and used it mainly to spray our fields with, when we moved he sold it. I also didnt know if anyone knew how much better gas mileage an older 7.3L diesel f-250 or 350 might have and the difference between the two. I also realize that in the gas the engine matters so how about a 390 comparison and also a 460, I hope Im making sense and thanks for your comments

 

OK 1st post so I will go easy and welcome to the forum.

Those 2 truck's would get the same exact mileage depending on if they have the same motor, trans and gear's.

What year are you talking about? They did not offer a diesel from the factory in the 73-79 F-series.

I would think the 460 would use more gas than an FE motor but not a 100% sure.

 

The diesel would get the best gas milage than any of then. It uses diesel. Sorry couldn't pass that up.

 

OH HAHAHA, LMAO, you are slick74. That one slipped right by me!

 

Austin, I think more about power than fuel milage so I'm sorry I'm help.

 

I have had 4 f-series trucks,mpg as follows:1984-f150 300 4-sp overdrive--about 17mpg
1973-f100 360 2bbl,AT low geared --about 10mpg
1979-F150 4x4 351m,AT,3:50gears,33's--about 10mpg
1990-f350 dually,4dr,460 AT overdrive,4:10--about 10mpg


These are averages,not on interstate at 55.---The dually once got 13,empty,4 adults on interstate.

My little contour once got 41mpg on a downhill stretch on i-40 but EVERYDAY average,no interstate,is about 26mpg.

 

Hey thanks for your comments, yeah I realize about Ford not making the diesel in the 79 model but just was wondering the difference between a 7.3 L diesel F-250 and 350, not between the gas and diesel, sorry about the confusion

 

https://www.ford-trucks.com/forums/s...ht=fuel+economy

Here is my take on Fuel mileage.


By the time you are finished reading this you will be able to answer this question

This chart is for any engine/vehicle combination.
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Considering the FACT there are so many variables regarding fuel economy it would be hard to get a specific answer.

Things to consider:
1)Quality of Fuel
2)Additives
3)Tune & Efficiency of Engine
4)Altitude
5)Driving technique
6)Topography where you are driving
7)How much city/how much highway driving
8)Gear ratio & size of tires
9)Weight of the vehicle
10)Tire inflation
11)Vehicle design (drag)
12)Clean air filter

Just to name a few.

I drive a 78 pickup with a well tuned 429 engine,at an altitude of 3400 ft above sea level,with normal weight on the truck with a canopy,tires inflated to spec,using premium fuel,2.75 rear,C6 Trans, With my foot on the pedal like there was a egg under it, in Canada in a city that the downtown is located in a valley.

I get 14 city & 18-19 hwy.

Does this help ?

 

Bumpity bump