Leaf Spring Blocks and MPG

[TheTrueMoron]

I'm about to replace my stock leaf spring blocks with the 3" blocks to get back some of the rake after putting on a leveling kit. Since my leveling kit decreased my MPG's a little bit, I'm wondering if putting back some of the rake could give me a little increase in gas mileage. I know it wouldn't be as much as before since I will have more ground clearance overall and there won't be as much rake as factory, but it's just a curiosity thing. Any thoughts? Personal experience?

[Carder09]

From my understanding of wind resistance and flow, I don't think raising the rear end with the level you put on it will give you back your mileage, the stock height is what GM placed it for optimum mileage and handling. Think of it like a sports car, they are low to the ground to allow as little air underneath the car as possible to prevent front end lift, though they also counter that with dampening force from other components on the car, aerodynamics and other factors they use to make those machines so hence and forth on lol. Another good example is how the new Ram's have the auto suspension that lowers the truck at a certain speed on the highway to achieve even better mileage.

[maxco]

I'm surprised just adding a level decreased your fuel mileage...are you still stock tire size? Did you get an alignment after install?

 

I added a front level & rear 3" block and I didn't see any change in my fuel use.

[cobrajet84]

I'm surprised just adding a level decreased your fuel mileage...are you still stock tire size? Did you get an alignment after install?

 

I added a front level & rear 3" block and I didn't see any change in my fuel use.

I agree here, I didn't see any notable decrease in mpg's with my level and blocks installed. I'm sure it dropped a little, but like a said not enough that I noticed.

[TheTrueMoron]

Just out of curiosity did you guys add the level and the rear blocks at the same time, or at different times?

[cobrajet84]

I added mine at the same time.

[Chris]

I did blocks a year before I did a level

 

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[maxco]

I did mine at the same time too

[tyhuck]

I was wondering the exact same question this afternoon.

 

I think its actually a matter of the amount of air getting under the truck and causing drag. It does make sense to me that adding a rake will reduce drag underneath the truck, but not to the level of a stock height truck. I just put a level and AAL, and a set of 285s, on a truck that I bought Monday, so I will have no idea how it affects my mileage because Ive only put a 1/4 tank through it.