on the interstate stock i was getting about 21-22, with 32's i got about 19.5-20 and now with 33's i get about 18.5. i have an intake only performance wise

 

i dont understand why u would lose any?

 

the lift alone shouldnt make much difference, its the tires that will kill your mpg.
all tho lifting a truck will cause more drag.

 

yeah, mine has gone down about 2 mpg highway with 32s.

 

yea but he didnt ask anything about bigger tires...all he asked about was the lift....I can understand bigger tires, killin some but not just picking the truck up alittle...

 

lift will affect gas mileage cody. maybe not alot but that extra drag makes the engine work a lil bit harder to keep the speed up.

 

but wheres the extra drag?? Idk i understand wat yall r sayin but i dont think i notice any difference....

 

ok lets say our trucks are a block. lifting it makes it a bigger block. by making it a bigger block it pushes more air which is resistance. maybe 1 mpg loss at most i would assume. you have an intake and exhaust though helps compensate.

 

2 inches is so miniscule...its when u beef up ur tire sizes and add 4+ inches...the bigger size and weight is when our trucks become blocks

 

2 inch lift? guarunteed u wouldnt notice more then halfa mile...tires are what robs u the most in gas mileage.

 

yea the block gets taller...not bigger...the bottom of the block would come up along wit the top of the block...It will sit higher but would be any more of a block.....just how i think of it...

 

hold your hand a liitle bit out the window driving. Feel the resistance. Stick it out farther and the drag increases. Adding height to your truck is basically the same thing.

 

so does the wind push on it more if u lift ur hand higher out the window...no its when u add more to it....i understand more to push but theres not more to push...Its just taller....

 

Okay okay. Let me refrain my question. What kind of mileage are you getting with a 2" lift AND bigger tires (I figured they kinda went hand-in-hand, which is why I didn't clarify)

I plan on running 32's.

 

duckfarmer look at my first post it should provide you with what you want

 

Yeah I saw that. Thanks man, I appreciate it.

 

yea ur gonna lose some..I didnt see a huge difference, but i got exhaust and intake....

 

I would have to agree with koda on this one...
lets look at the drag formula first
FD =1/2 *p * u^2 * CD * A,

where

FD is the force of drag, which is by definition the force component in the direction of the flow velocity
ρ is the mass density of the fluid
u is the velocity of the object relative to the fluid,
A is the reference area, and
CD is the drag coefficient — a dimensionless constant

simply lifting (restrict to suspension lift) the truck without putting on bigger tires..wont change any variables in the formula...so...drag force on your truck is the same with or without the lift...you feel more drag on your arm when you stick your arm further out of the window is because you increase the surface area of the object...hence..increase drag...
so...suspension lift wont effect your mileage...but body lift will by slightly..cuz you increased the surface area of your truck (thats what the 'big block' theory comes in)...but really..not by much...its the bigger tires that kill you mileage...

 

ok... someone who is lifted will get worse mpg than i do...


look at it this way... its easier and requires less force/effort of your curling weights because your hands are closer to your body... as opposed to doing butterfly lifts with the same weight... same concept, but different force is required and you will get tired at a different rate = using more/less gas

 

I dont want to be a dick here...but

its different when you curling weights...you are talking about moment instead of force..
the force you need to lift any thing is the mass of the object*gravitational acceleration (g=9.81 m/s^2)..in your case..the mass of the weight isnt changing..so the force required to lift the weight is still the same no matter how you do it. its like no matter where you stand...you apply same force to lift same weight..
when curling weights...you are actually making the weight to turn ( a circular motion)..(not a straight up and down motion anymore..)tho the force is still the same...moment formula is calculated by force*distance....its hard to curl weight when you straight your arms because you increase the distance...not the force...

here is what im saying..
say you curling 50lbs..and you have a some sort of stand that can only support 50lbs
bring your arm close to you while holding the weight... and then rest on the stand...the stand will support the weight
now straight your arm...you will feel its harder to hold the weight...but if you rest your arm on that stand again...the stand will still support the weight...
because force is same

 

I was at 20 mpg k&n filter, custom exhaust, and a gerry/james tune. When I lifted and installed the 32 inch tires I lost 3 mpg.

 

Ok people stop curling weights....

Think of racing, closer to the ground, less air is traveling under the vehicle, go faster and more aero dynamic.

Lift it up and now your causing more drag in a slip stream effect, more air is going under you, slowing you down.

 

and yes, I am lifted 2 inches. Getting tired of the poor mpg's, so I actually lowered the front an inch to try and be more aero dynamic. Doesn't help that I am running 265x75's on steel wheels either.

 

Everyone earlier was saying it decreased mileage from a surface area perspective, but you're not changing that at all. It's the air going under your truck, as opie mentioned.

Bigger and heavier wheels and tires are going to hurt your MPGs whether you are lifted or not.

 

As above, however a suspension lift can cause the same drag. Air flowing under a vehicle meets a lot of turbulence, nothinh is aerodynamic under a vehicle. Hence the reason newer full size Chevs have such a low front fascia.The lower to the ground everything is, roof line and suspension, greatly reduces drag coefficient. Lance, you are the Engineer, pipe in here.

 

As being said, surface area is the variable here.
the only reason why racing cars are designed so low to the ground is to reduce drag force ( we all knew that)...and the only way to achieve this is to reduce surface area of the car body because thats what is in contact with air..and moving air slows your vehicle down...
by building race cars so close to the ground..you eliminate the air gap between the bottom of your car and the ground...so there is no air in contact with the bottom of your car..in that case..when you calculate the drag force..you dont have to consider the surface area underneath your vehicle..hence..less drag..

and also..turbulence is our FRIEND..lol..yes..it is...thats why we have spiral antenna on our truck and..also thats why golf balls are dimpled

 

I myself had a 2" lift with stock tires for almost 2mths..didnt notice any difference in MPG..but once I put on 31s...thats where the nightmare started..

 

On my '05 Z71 ext cab with 1.5" lift and stock Generals the best it got was 21 mpg. When I went to 32" more agressive tires the best I could get was 19 mpg.

 

So just adding 1 inch to the tire size I can expect my MPGs to hit the fan. I wonder if it can be made up though with a tune and exhaust...

 

surprising what 1 inch can do...if u tune and exhaust u will have no prob making that back and some possibly

 

this debate is dumb...we drive trucks, be happy u drive a colly and not a fullsize...19mpg's is still damn amazing...for a truck. if u realy care about the mpg's u wouldnt of bought a truck in the first place. im all about conserving and trying to get the best out of my hard earned money that goes to gas however, i like my truck to have larger tires and a lil lift so i understand the negatives that come with it. this isnt rocket science...ur mpg's arent going to dip below 16-17 mpgs so lets not get crazy here