In Reply to: Ford 3000 fuel consumption posted by Larry on February 10, 2018 at 10:00:13:
Threads like this are always interesting.
All too often you get a lot of guessing and swags in a thread like this but fortunately for us we have the great Nebraska Tests which allows us to compare apples to apples.
I think the number you are looking for is what they call horsepower hours per gallon.
They have a couple of different numbers for each tractor based on pto speed and wide open.
Hp-hrs/gal on a 1950 8N was about 11.2
On a 3000 it does make a difference which transmission they tested. The straight up 4 sp was more efficient than any of them. The SOS was least efficient.
For the 8 speed the hp-hrs/gal was about 11.6
So not a huge difference between the two tractors.
You mention you have a Zenith carb so keep this in mind.
The original Holley was a very efficient carb.
But... After 40 or 50 years the vacuum activated piston which operated an economizer valve (think accelerator pump) is probably worn out. So the Holleys are balky, cold blooded, finicky things.
You could find an original Holley, try your hand at rebuilding it and you'd probably get a substantial improvement in hp-hrs/gal.
The Zenith is far less efficient.
But... If you want your tractor to RUN, stick to the Zenith carb.
Just for kicks I looked up the hp-hrs/gal on a 3000 diesel 8 sp.
It was 16+
You can see why the ag world went to diesels.
Those 3000s are my favorite tractors.
I spent about an hour on mine today snow plowing the driveway.