Ways to increase MPG

[99 Z71]

i have been looking for ways to increase the gas mileage on my 09 silverado 5.3. i average 20 mpg on my 35 mile highway drive to work which i think is pretty good but my city mpg is pretty bad. i was wondering if the afm can be tuned to help out with this and how much a tune would help my mileage.

[sstoner911]

i have been looking for ways to increase the gas mileage on my 09 silverado 5.3. i average 20 mpg on my 35 mile highway drive to work which i think is pretty good but my city mpg is pretty bad. i was wondering if the afm can be tuned to help out with this and how much a tune would help my mileage.

A custom tune would help..how much really depends. Whats the mileage in town now? Any other mods? Gears? Tires?

I have the 4.8 and my latest in town mileage is 15.5 MPG. Highway is now around 18 MPG for me. But, I drive fast and have 4.11 gears etc....with my custom tune.

[BadAss]

My suburban averages 11, but I found a way to increase my mileage to 30....I leave it parked in the garage and commute on motorcycle. LOL

[BrownPats420]

haha amen to that dude

[Sierraowner5.3]

you already know all the tire psi stuff. some things to look at, K & N drop in AF, or a full CAI, custom tune, a flowmaster or magna flow will help. all that will get u 1.5 to 2. biggest thing is to keep your foot out of it. (something Im bad at.)

Alex

[99 Z71]

My city driving is around 15 mpg I have allredy added a k&n filter and flowmaster 50 series. I read somewear that the afm can be tuned to get better mileage has anyone tryed this? Also are underdrive pulleys worth it?

[silveradotrailblazer]

Don't get underdrive pulleys. They slow the power steering down. Try switching ALL the fluids to synthetics, engine,transmission,axle diffs.