Well after reading all the reports about deckplate mods, elbow removals & such, I decided to do some experiments with my truck. I have a K& N FIPK installed with a throttle body spacer & have been pretty happy with the performance.....I was really looking for better fuel mpg not really concerned with h.p.. This past week I removed the FIPK, which while installed I have been averaging aprox 19 to 20 mpg in all around driving. I re-installed the stock airbox whick is drilled out....similar to the deckplate mod, & has a K& N drop in filter. Now I do admit there is not really a noticable increase in h.p. with the K&N FIPK....maybe in the upper rpms if any, but there is definately a difference in mpg. In my average-all around driving with the stock-drilled out air box I was getting aprox 14-15 mpg. With the K&N FIPK I was getting 19-20 mpg. To me that is quite a difference. My biggest complaint about the FIPK is the additional noise it creates...but the increase in fuel economy out-weighs the annoying sound. I hope this helps anyone who is looking to get the most mpg out of their rig.