how to get better gas milage 1998 yukon 5.7

i just bought a 1998 yukon , and it has the 5.7 in it , how can i get better milage out of this 5.7. im getting ready to order the k/n cold air intack . witch is about 250 . if theres anything else i can do to this 57 to help with gasa milage please let me no . thankyou . i have an 2004 4x4 HMC sierra with the 5.3 and i get 18hw and 15 city

i just bought a 1998 yukon , and it has the 5.7 in it , how can i get better milage out of this 5.7. im getting ready to order the k/n cold air intack . witch is about 250 . if theres anything else i can do to this 57 to help with gasa milage please let me no . thankyou . i have an 2004 4x4 HMC sierra with the 5.3 and i get 18hw and 15 city

Even with a CAI you won't really improve your mpg without changing your exhaust too. More air in means you need more exhaust out to be efficient. This mod will only improve you mpg slightly if any. A custom tune along with a CAI and exhaust will improve your mileage about 1 to 1.5 mpg. Doing these mods is actually for more power and not for better gas mileage. The best way to get better gas mileage is keeping a lighter foot on the pedal and not letting your tachometer go above 2000 rpms. Many of the truck sites will tell you that keeping your tach at 2000 or lower especially when cruising will give you much better mileage.