K&N Part 63-3064-1 on 2008 Chevy Colorado with 2.9 liter, manual transmission, 3.73 gears, 31x10.5 tires.
Based on a week of 45 mile commute 60 at 65/75 40 at 55 mph:
At 65 mph where legal, gas mileage increased from 22-23 to 25-26 mpg.
At 75 mph where legal, gas mileage increased from 20-21 to 22-23 mpg.
It will pay for itself within a year if those numbers dont change.
Nice throaty sound through most of the range, but at wide open throttle sounds like a belching Walrus BWAAAAHHHH
Hills that I used to take in 5th gear resulting in 5-10 mph drop I now have to downshift for. Seems like I lost power below 2300 rpm with the KN. Power above 2600 rpm is not compromised and might be higher.
The heat shield doesnt seal very well. Large gaps at the front and rear edges. Bottom seals well. Intake temp when moving is same as outside air.