your spedometer will be 5 mph off at 60 mph with 31's take your miles on your trip meter and multiply them by1.1 to get your actual mileage that 320-350 miles is actually 350-385 miles

 

You got points there. I never thought of it. Hope this dodge cold air intake will work well on winter.

 

Another point to this discussion (I know, it's a old post, but I didn't bring it back to life)....in the winter, you all mentioned the fuel mix ifferences, but the trucks use more gas overall, too, because the engine runs so inefficiently when it's cold. So, from startup to the time when the temp gets to 195 (or 180, if you have a 180 t-stat) you're burning more gas b/c it has to work harder to drive your truck AND warm up. Once the truck is warm, it'll run within normal parameters, and your fuel economy should be normal (minus the difference for the winter blend fuel).

I notice this every morning....I start up, warm up for 30 seconds and leave and my fuel economy drops like a rock on the overheard console, then gradually starts to rise back to normal as the engine warms.

As the outside air temps warm up, your fuel economy will get better because the engine isn't working near as hard to warm up, and, of course, we're back to summer blend gas, which is so much more efficient.

 

Why buy a K&N Cold Air Intake? The colder that air is, the more dense it is, and denser air provides more oxygen in any given volume (inside your engine cylinder), allowing your engine to burn more fuel and generate more power.