33.5" tires on 13' Screw with ecoboost
08-08-2018, 11:07 AM
#1
Junior Member
Thread Starter
33.5" tires on 13' Screw with ecoboost
If I go with a 305/65-18 I will get a 33.5" tire versus the 275/65 stock which is about 32". Will it bog it down and get crappy mileage or will it drive similar to stock?
08-08-2018, 11:11 AM
#2
I’m no expert. But you will definitely see a decrease in mileage. From what I have read prolly around 1mpg due to the heavier tire compared to stock. Your Speedo will also be off a bit but Idk how much. And expect your ride to be a little harsher.
The following users liked this post:
Erock78 (08-09-2018)
08-08-2018, 11:58 AM
#3
Boost :)
What rear gear do you have? That will make a difference if you have the 3.15 versus the 3.73.
I have 305/55/20 (33.25" or so) on my truck with 3.31 rear end gear. You will have a drop in mileage, but I noticed virtually no difference at all in how it drove and performed. They are definitely heavier tires and put more drag on the truck, but the mileage is the only area I noticed it. I have driven the truck with these tires stock and MPT tuned as well. The engine makes enough torque down low and throughout the RPM range that it really doesn't make a difference in a tire of that size.
I have 305/55/20 (33.25" or so) on my truck with 3.31 rear end gear. You will have a drop in mileage, but I noticed virtually no difference at all in how it drove and performed. They are definitely heavier tires and put more drag on the truck, but the mileage is the only area I noticed it. I have driven the truck with these tires stock and MPT tuned as well. The engine makes enough torque down low and throughout the RPM range that it really doesn't make a difference in a tire of that size.
The following users liked this post:
Erock78 (08-09-2018)
08-08-2018, 02:51 PM
#4
Depends on how sensitive you are tbh. I went to 34.5" from 32" and I don't feel like my truck is any slower. If you have a 5.0 maybe you'll notice it a bit more than us guys with tuned EB's maybe? Not trying to start a debate or anything
08-08-2018, 06:50 PM
#5
Senior Member
I'm also tuned, and can get the tires to chirp in second if I wanted to. 3.55 5.0, 295/60r20 without a tune? No thanks, I'd rather drive a prius. Unbearable lol.
The following users liked this post:
Rougen123 (08-08-2018)
08-08-2018, 10:15 PM
#6
How's she goin' eh?
i went from stock 275/55r20’s (32’s) to 305/55r20’s (33.2) and didn’t notice the mentioned 1mpg loss. Could be a placebo, could have happened..
i also got lucky on having to recalibrate my speedo. I used a gps and compared it to my truck while driving, at 70mph it’s off 2-3mph, anything less than 50 and it’s 0-1mph off.
i also don’t think the extra weight is noticeable, the truck still moves pretty good for a 6k lb truck. Gearing might help, specs in my signature. 5.0L and 3.73’s.
08-09-2018, 04:34 PM
#7
Junior Member
Thread Starter
i went from stock 275/55r20’s (32’s) to 305/55r20’s (33.2) and didn’t notice the mentioned 1mpg loss. Could be a placebo, could have happened..
i also got lucky on having to recalibrate my speedo. I used a gps and compared it to my truck while driving, at 70mph it’s off 2-3mph, anything less than 50 and it’s 0-1mph off.
i also don’t think the extra weight is noticeable, the truck still moves pretty good for a 6k lb truck. Gearing might help, specs in my signature. 5.0L and 3.73’s.