Tire size & mpg

[domdes]

Hi everyone I am new to this sight so i'm sorry if this has already been asked, but hear it goes . I have a 2010 silverado 1500 Z71 4x4 5.3 stock tire size is 265/65/18. Ordered RC 2" leveling kit. I want to go to ether 285/65/18 or 275/70/18 Cooper AT3 on stock rims, how much mpg loss will I see from stock tires? I also ordered a K&N 63 series aircharger intake. Wondering how much increase in mpg that will get me. Anyone have these modifications on there truck? Any information would be great. Thanks in advance.

[RyanbabZ71]

I have 275/70/18's and lost right at 1mpg

[chupe442]

Gains in intake, minimal... Loss in tire size is going to be noticeable but not huge (maybe 1-2). I like the Cooper AT3's. Had them for a couple of weeks now. A bit louder than the Bridgestones , louder than I remember my BFG All Terrains but way cheaper! Did the 2" level and went with 275/70-18's Nice look!

[domdes]

Thanks,chupe442 the Cooper AT3'S ,are they p-rated or LT's? In other forums people say they lost up to 4 mpg with LT's because of the extra weight.Ryanbab Z71 what type of tires do you run?

[butzers09silverado]

I have E rated general at2 285/60/18 and tire pressure on these tires is the difference between 4 and 1 mpg loss lol.... 2nd tank of fuel i'm running 48fr/38rear and only down 1 mpg. previous tank was 3 running 34 all the way around.

 

at least now i won't be worried putting a load of mulch, stone, or whatever in the bed because the tire is waaaaaaaay over kill lol.