Diesel Fuel Economy

FordGolfer7 · Apr 23, 2019

I am looking for information relating to the best fuel economy I can get in a 1966 F100 with a diesel engine. So far from talking to local diesel nuts, Tucson, it seems the Cummins 6.9 with a rotary pump will provide the best MPG. However, I have recently had discussion about a 24 valve cummins with a rotary pump being the best. I would appreciate any thoughts, opinions, and/or facts concerning this endeavor.

RanniWins · Sep 27, 2021

The best I got was just under 8mpg on my motor trader truck. I must admit I was very excited when I was able to count the miles on two hands! The fact is that the savings do not depend on additional injections or the turbine, but simply on the driving style. I decided to start driving at a different pace, although I sometimes get very different indicators, especially with a load or in bad weather.

Clb · Sep 27, 2021

He aint towing much with an f100
But 8 does sound fair ...
Op what are the build plans?
Some usage needs might help here!
Most "modern" diesel engines should beat the 352 fe that truck had....

Shadetreemechanic · Sep 27, 2021

If you are not towing, I would lean toward a 4bt cummins.

u2slow · Sep 29, 2021

I like the thriftiness and zip of my mildly tuned '90 D250 5spd. That's what I would use as a chassis donor for a classic truck to DD. No computer crap to deal with.

The 4BT will cost more to procure, more vibration, and less power (aka fun).

Diesel Fuel Economy

FordGolfer7

Registered User

RanniWins

Registered User

Clb

Another old truck

Shadetreemechanic

Full Access Member

u2slow

bilge rat

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