I've read through tons of threads and only found one guy on here who, kinda sorta helped with his thread.

I'm looking into getting a set of 275/60/20 on my oem rims. I have the 5.4 engine and I am concerned about my mpg.

So my question is...

Does anyone have 275/60/20...

And have you noticed a difference in MPG, going up from the original 32" tires to a 33" tire?

Also wanted to add that I won't be going with anything too aggressive. Just a quality road tire.

 

You will probably lose about 2-3 mpg. That tire is not too wide, but it does weigh more than OE, and has a more aggressive tread. I have 38x15.50's Toyo MT's on my 05 with the 5.4 and it averages 11-12 mpg. I have seen 14 highway with a really good tailwind, and 9-10 in the city with lots of stop and go.

 

There are few threads about this... From what I read it shouldn't change much going from 275/55-20 to 275/60-R20 mainly because the width is the same.

Unless you pick agressives mud tires should be about the same.

Will let you know next week getting my Cooper Zeon LTZ install in the same size as you're looking at.

 

I just made same exact switch to 275/60/20 in Cooper Zeon. Took my garmin gps in truck with me after and at 60mph it is almost dead nuts on using the needle on dash speedo. Going to try digital speedo next on advanced menu settings. I wouldn't even mess with it. I was worried and researched to death and dealer couldn't even do recal based on that tire size. No notice in change in shift points either.

 

So sluggo1, you're telling me your MPG is almost exact same as the originals??

 

Not saying MPG is same because it is too soon for me to check difference since I just got them 2 weeks ago and have not driven truck more than a half tank...I am saying the speedometer is accurate (which if it were not would affect odometer and trying to do calculations for accurate mpg) and the tranny shift points don't feel any different..the cooper zeon ltz is an xl load rating tire. so a little heavier than the stock pirelli's but not as heavy as an LT rated tire..I am sure going up to a 33" from 32" will affect the mpg but guessing it will be very very minimal..plus I don't put any stock in the instant mpg graph on the truck. I prefer to do the math when I fill up my truck with gas..I have ecoboost so many also say optimal mpg won't even show up until 10,000 miles or so on the truck so it is not a factor i am worried about at this time..If you were jumping up to a 35" tire then I would worry more about how many mpg you might lose but with just a 33" tire I wouldn't even think twice about it..

 

Loose 2-3MPG no way sorry... maybe 1, max.

Going from OEM wrangler to more agressive LT on my previous EB (original size) didn't change my MPG at all. Going from P rated tires to XL shouldn't change anything either.

You're talking about 38inches tires... this is not what the OP is looking at and the Zeon are not that "agressive" IMO

Cheers

 

Unfortunately your response doesn't help much. I have a 2010 5.4 w/6speed tranny, 4" Rancho and 35" Nitto Trails. Different scenarios completely. That's why I posted in the 2009-present section.

 

I went from 275/65/R18 (32") to 275/70/R18 (33"). So the only difference is that I have the 18" rims, but it's a similar tire size increase. Sluggo1 is correct in that the speedometer is more accurate now. I did a similar test with GPS.

I went through two tanks of gas. One was mostly highway and the other was mostly city.

It seems I lost 2 MPG on the highway and 1 MPG in the city.

Edit: A bit more info. The stock tires were 39 lbs each and my all-terrain tires are 55 lbs each.

 

Now that's good info!

I'm a bit surprised but it looks like you know what you're saying ;-)

Cheers