What is the mpg difference between a 6.4 ps diesel and the 5.4 gas on a 350 4x4 8ft bed cc srw 3.73?

 

What are you planning to do with it? With no load, not towing anything, the mpg's are probably not all that different. The diesel probably does slightly better, but the additional purchase price increase would make it a very long time and many, many miles before you saw your money back.

However, start towing and things change. The 5.4 will quickly drop in to the single digits for mpg's...where as the diesel should stay in the very low teens unless loaded to absolute maximum capacity.

I guess my personal thoughts on an answer to you question would be:

Unloaded: 13ish on the 6.4, 10-12 on the 5.4.

Towing: 10-12ish on the 64, 4-8 on the 5.4.

One more thing...you will know if you are towing with the 5.4. It is barely adequate for the 3/4 to 1 ton trucks unloaded as it is. Add 8,000lbs behind it and you will be horribly disappointed.

The diesel will not break a sweat with anything under 10,000lbs.

Just my two cents,
Mike

 

thank you i plan on towing a 20 ft boat at least twice a week from june through feb. and a camper maybe twive a month

 

Wasn't worth the price of the diesel to me. I have a 250 with the 5.4L(4x4, king cab, 2 inch lift) I tow tractors and bobcats and what not on a daily basis with mine and it does great. I average around 13.2 mpg around town not towing and around 11 mpg towing my 6,000 pound bobcat with my 7 ton hudson trailer. Everyone told me not to get the 5.4L. But after 10,000 miles im very very happy with it. Gas is cheaper, The gas engine is way cheaper, The gas is way easier to maintain. I have a dumptruck with a detroit to haul anything that my 250 can't.

 

the 5.4 is a little underpowered for daily heavy towing. i got a 01 250 5.4. i plow alot winters and it does great, of course thats not half as the strain of pulling around 7,000#

 

The 6.8L tows great with the 4:30's - no dissapointment there...

If your concerned about gas mileage - there will be disappointment...

Since I don't care about gas mileage - I'm not dissapointed