Stock vs 33" MPG

Hey guys, anyone have any MPG insight on going from stock 32" tires up to 33"s? My truck is a 2013 4x4 base model 4.6L. Thanks

 

The difference is so small at that size that you won't notice it.

 

My situation with 33’s leveled on a 2wd; LT tires and 20” oem wheels weighing in at nearly 96lbs on each corner, lost about 2mpg over my almost 1200 miles.
Now for reference I’m lowered 3/5 on an oem wheel and passenger Goodyear’s and average slightly more. Weight was my largest issue I believe.

 

Welcome from NY.

 

shitty to shittier, probably

 

If you have to ask you can’t afford it.



welcome.

 

Depends mostly on tire weight and, at lesser degree, on compound softness and thread pattern.

Same tire, just inch bigger? Unluckily you'll see anything different. Aggressive LT AT, soft compound? -2 MPG.

 

Hahahaha thanks guys, love the honestly.

 

I'm on 33" (275/70/18) BFG KO2's with the stock TRD 5-spoke wheels. No idea the weight but I am averaging 16.1MPG on the trip computer combined city and highway driving with my 4.6L. I have a ranch hand bumper on the front so I imagine I'd do better on the highway with a stock bumper. I also drive like a grandpa.

 

The tire design/construction is a far more important factor... so which are they?

All else being equal (same tire model and load rating) the larger diameter will make your gearing 3% higher and raise your truck .5 inch. No measurable difference.

 

Welcome. I swapped out my 20" OE Sport rims and Bridgestone Dueler Alenza HL tires for 18" SCS rims and 305/65-18 Wildpeaks. The Falkens are HEAVY tires. So...depending on tire weight, your MPGs will vary. I lost 2-3 MPGs on average.

 

It isn't the weight; that has a tiny affect. Thick tread and AT tread, E load rating, contribute. Did you get a lift too?

 

The extra tire weight had a little bit of an effect, put that with a 2-2.5" list in the front and you'll notice the drop.

 

I went from 31” to 34” tires and lost 1 or two mpg. My new setup is 1.5lbs lighter at each corner so the mpg loss was likely due to the change in gearing and 3in lift.

 

Hmmm, so rotating mass has no effect on MPGs? I'm pretty sure it does as it will take more revs to get the truck moving. I do know that the wider tire and more aggressive treads also affect MPG. My MPG did not change when I was level vs 3/2" lift with the Wildpeaks. My MPG was mostly changed with the tire change. The difference in diameter doesn't help with MPGs either. lol

As for the lift. When I leveled the truck and then when I went to the top setting on the 5100s, I didn't notice a drop in MPGs at all.

 

I replaced my stock tires with 275/70 18's. I'm on my third set.
If mpg decreased at all, it was negligible.

 

I bet if you calculate it manually you aren't getting that high.

 

Here is a copy/paste of a comment I made in another thread. The difference in mpg was drastic (IMO) when comparing lifted with bigger tires and OEM.

I recently put my 2019 Limited back to the stock suspension and wheels/tires. My avg fuel economy was 12-13 mpg with the 34" 285/20 Nitto Ridge grapplers, 1" lift in rear, and 3" lift in front. Since putting everything back to stock, I now have an average fuel economy of 16.5-17.5 with a best of 19.3 while cruising about 70 mph. My truck doesn't look as cool anymore but it drives so much better and with gas at almost $5/gallon where I live, I can livewith an ordinary looking truck again. LOL!

 

I dont think a 2 inch lift would matter. The TRD Pros come with a 2 inch lift and I think their MPG numbers are the same as a non Pro, right?

 

I can only tell you about my results. I don’t think the TRD Pro is a full 2 inches lift in the front. The tires on the Pro are 275/65/18 Michelin ATX. Increasing the height, width, and weight from that will impact fuel economy. Tread design will also affect it.

 

I have similar results as @Arminius. I added a 3/1 lift and 275/70r18 rugged treks and went from 15.7 mpg to 13.

 

Very little. Tire rolling resistance (internal friction) is the main thing at slower speeds. There can be a big difference depending on the compounds used, thread thickness, how robust the sidewalls are, etc. The big fat heavy tires I put on mine actually do better in town, but that is unusual. It's about the same on the freeway because aero is worse. I don't have a lift yet. Most "offroad" tire makers don't care about mpg, and some are truly awful. If you want to find a tire that doesn't suck too bad, look at the speed rating. High speed is usually good, because the main limiter is temperature, caused by internal friction.

 

Last time I topped off the tank I reset the trip odometer so I can check it manually and I’m going to the gas station tomorrow so I’ll report back.

 

I have noticed with my truck it can either be higher or lower than what the truck computer claims its very frustrating.

 

According to my own math, I got 16.7 on this last tank. That’s pretty accurate when compared to the trip computer given that I don’t reset the computer every fill up. In theory, the MPG would be a couple percentage points higher than indicated because the tires are a slightly larger diameter than stock which yields a greater distance traveled for a given odometer reading. The tire diameter between what I’ve got and what was stock are close enough that I’ll be conservative and not factor that in.

 

2016 4wd w 5.7. Moved from stockers to 275/70-18 E load AT. Between the heavier weight, more aggressive tread, etc I lost 1-2 MPG with normal driving. So yes, you will take a little hit on MPG going larger.