I have a 01 Ranger Edge 2wd regular cab, and I recently got a clutch replacement. I’ve been noticing that my gas mileage has dropped drastically. Not sure what it is. I’ve noticed that when I’m low on motor oil my mileage will go down then I top up and it’s fine, so I’m thinking maybe it’s the same idea with the transmission. They put the same oil back but and it needed some new oil or it just dosent have enough.

 

Oil in engine or transmission wouldn't effect MPG, nor would a new clutch

Change your O2 sensors, they only last 12 year or 100k miles after that MPG goes down

Pull out 1 spark plug and have a look at the tip, light brown is good, dark brown or black means Rich running and poor MPG

Locking gas cap?
lol

 

Hey so I changed them all out and have driven the truck for a while and haven’t noticed any difference. The sensors were in pretty bad shape so the job was necessary for sure. Any other things?

 

Outside of a fuel leak, no, not really
Or a neighbour with a siphon hose, lol

What size engine do you have?
2.3l or 2.5l 4cyl(2001 can have either), 20+ MPG
3.0l V6 OHV, 18+ MPG
4.0l SOHC V6, 17+ MPG

Assuming stock tires and gearing
Larger tires change Odometer reading lower, so false Low MPG

 

I have the 3.0 v6 w some 33s but w the air filter I put in it balanced out. It became bad after I got my new clutch installed. So that’s what has me thinking like what does it have to do with. Because it was fine before

 

Clutch replacement would have nothing to do with MPG directly
Maybe the work removing transmission caused a leak in a fuel line you haven't detected, seen or smelled

33" tires would certainly mean odometer will be very low so you can't use that for calculating miles travelled
You could use a free GPS App on your phone to determine how far off odometer is for future calculations, set trip meter to 0 and turn on GPS App drive until App shows you have travelled 10 miles
See what Trip meter shows at that time, most likely it will be about 6 or 7 miles, so 30-40% less than actual
So if your MPG was 12mpg then actual would be 16mpg, which would be about right for lifted Ranger with 33" tires