I have a 2006 3500 4x4 6 spd just rolled 10,000 mil with straight pipe and just added the K&N stage 2 and per the overhead dummy Iam getting 17.5 at 75 on the high empty I will take I will check the next tank on paper but the dummy was saying 11mpg so if its even close its all good b ut still is hard to start dealer said yeah alot them have this problem but we dont know how to fix it !

 

What brand of gas to you use?