I am going to be detailing the mods that I have done to my truck to improve mileage. When I bought it, it was only getting 14mpg highway and scraping just above 10mpg in town. After everything I have done, I now am getting 16.5mpg city and 19.5mpg highway. I will be posting pics later. Hope this helps others out there as well. These are in the order that I did them.
Not Mods, but needed
1) Changed plugs to Autolite Platinums - When I changed them, they were mostly Bosch with a couple of Motorcraft. They were well used and looked terrible.
2) New wires - I swear by Bosh wires, these are the 8mm bought at AutoZone - I change my wires once a year needed or not - Lifetime Warranty
3) New O2 sensors - hooked up to my lappy with Digimoto - Not doing to well - CEL started coming on - Changed out the sensors and took care of that
1) K&N Drop in Filter - ya some say these aren't very good, but I have nothing but good things to say about them
2) Half-shaft throttle body - Polished Throttle Body - Noticed more power all the way through the RPM range
Should have seen it before, the carbon build up was nasty.
3) PVC Filter - I have made a PVC filter with a special media that filters the crankcase ventilation. The sludge this thing collects is amazing, why anyone runs without it is a mystery to me.
4) Ported and Polished MAF Sensor Housing - breaths easier and showed a noticeable improvement
5) E-Fan (Volvo fan with custom wiring) - This is where the big difference was noted. I went from 16.5mpg highway to 19.5. Some may think that is unbelievable, but I have tracked my mileage for a long time and now I am consistently getting 19.5mpg highway. Getting ready to install a temp gauge on the Tranny, all other indications is that it is fine.
6) Air box mod - I took out the silencer, opened up the box a bit and insulated the air coming in as best as I could.
7) Autometer Fuel Saver Gauge - this really helps with those fast starts and watching the deceleration. This is more for a driver mod than anything.