Originally Posted by The Curly 1

Ok, Here is an update. I lowered the car a while back, I put a front air dam on and I have put taller wheels and tires on it. I put an Airaid intake on it a few weeks ago. So far with all changes my mileage is up about 4.5 at highway speeds of 60 to 75 MPH and about 2-4 in the city driving. Results are not as consistant as I expected and there are some strange numbers on some of the runs but the improvements are showing.
My next mods will probably be the exhaust system then Trifecta tune and then underdrive pulleys. I am also going to make a few more cosmetic changes. The grill will be painted to match car and the little black plastic piece below grill will be painted. Considering a rear spoiler.
My goal was 5 MPG in the city and 10 on the highway and it appears that I may reach that goal. Trying to make one change at a time to verify each good or bad. On the exhaust I am going to replace entire down pipe and everything as one and keep complete stock system so if I have to I can go back and verify any changes. In fact I am keeping stock wheels, tires, intake and everything.
I do not believe I will get the full benefits of the intake and exhaust until I get the tune to match the fuel and ignition curves for the better breathing.
I do think it is on track to reach those goals and will let you know more as I learn it. Some people disagree with me about the exhaust and intake but if I am wrong I will post that too. Not the first time I have been wrong and certainly will not be the last time. No matter what happens my car is looking better, it is more fun to drive and I am saving a whole bunch over my One Ton Four Door dually I was driving.