blazer upgrades
 

Im gonna add 4.11 youkon gears, bored throttle body, comp cams and valves, k&i cai, flowmaster 40 series. Im gonna need some more power because im gonna add a 2 inch bodylift and 31 all terrain tires. would all this stuff give me enough power not to loose alot of mpg with the 31s?:icon_shrug:

The gears, lift, and tires arent going to help much with gaining MPGs.
I would think you might even out.

im not gonna put the gears on it anymore but how much mpg would i loose if im at 17 stock right now?

well the bigger tires, the lift would take it down a few. the CAI may take it up one or two along with the exhaust, add in a highflow cat too.

I might get one because my truck looks like someone drove it under water as much rust as it has under it. Will it sound better with a highflow cat on it?

my old blazer was getting 17 mpg with oem size tires(27"ish). i went to 30" and lost 2 mpg.

with 31's,you might be ok. Actually,what gears do you have right now? If you look in the glove box,youll see a big sticker with 3 letter/digit codes. find the gu codes. it'll be like gu1,gu2,gu3,etc. list it and i can find what you have if you dont know.

i have 3.42 gears right now but when i get the 31s im gonna put 3.73 in it

Cai wont increase mpg bigger tires definately will make your milage worse as will a lifted vehicle. Making more power will result in more fuel used.

I know that I'm just gonna put bigger tires to make it look better

OPEC loves you.....and your 31s