motownbrowne
Elite Member
- Joined
- Dec 30, 2013
- Messages
- 2,613
- Location
- river falls, wi
- Tractor
- Kubota mx4700 HST, New Holland TC-29D
I bought my personal "fuel hog" Ford 3400 TLB (same as 3000) 31 years ago with 1350 hours.
Now, 31 years later it has 1850 hours.
Using your fuel cost figures for comparison:
500 hours @ 15.59 hours of diesel per gal., I would have used 32.07 gal.
500 hours @ 11.97 hours of gas per gal., I did use 41.77 gal.
Over the 31 years, and the 500 hours, I have had the 3400 TLB, I could have saved 9.7 gal. of fuel, if my machine had been diesel instead of gas.
I understood my future needs, and bought accordingly. Gas or diesel did not matter.
I would have actually bought a diesel if I could have, but the gas (TLB) machine was a used cemetery machine, and in near perfect condition. Too good to pass up!
I think you're missing a piece of the math here. You don't get 11.97 hours from a gallon of gas (which would get you 500 hours out of 41.77 gallons), you get 11.97 HP hours per gallon of gas. That means you need more than one gallon per hour to reach the approximately 40 PTO HP. Say it had an even 40, with gas (at the 11.97 number for this motor) it'd take 3.34 gallons of gasoline to create the full 40 HP. So in 500 hours, you'd have used 1670 gallons of gas versus 1280 gallons of diesel using the same 40 HP and 500 hours, but at 15.59 horse power hours per gallon. Now, the difference is probably less than that in actuality since you probably weren't using the tractor at the full PTO HP rating for those 500 hours, but the difference is much greater than the 9.7 gallons you mentioned.