e-3s are worse than other chips. They have that darn funky ground electrode that shrouds the spark. They suck as bad as any other multiple electrode plug, like bosch +4s.... Avoid them. If you want to spend money on plugs, get something like autolite iridium plugs. They last forever.
The G-force chip is basically just a resistor that goes on your IAT. This makes your truck think it is getting cooler air in, so it dumps more fuel in. The best part of it all, that only lasts for a little while until your ECU leans it back out from the O2 readings. Then you throw a CEL. If you really want one, I will sell you one for 90 cents plus shipping next time I go to radio shack. (and still be making quite a profit) Seriously, don't do it. If you ask me to send you the resistor, I will send you a strongly worded letter instructing you to stop hating your truck and show it some love instead. If you pay someone $70 for that resistor..... well we will all point and laugh.
This will do more for your truck than that resistor ever will.
You can swap out to an electric fan... search this site for hhr fan. Full exhaust including headers, high flow cat and mandrel bent pipe into a good flowing muffler will be good for a few horsepower and a mile or two per gallon if you drive softly.
If you want to increase mileage, block off the vacuum lines that are leading into your air box, then pull out the parts of your intake assembly that are running below your intake box. From there, run a tube down from the air box to collect air near your exhaust manifold. Hot air will give you slightly better fuel mileage.
While you are at it, optimize your throttle body. To do that, you take off your throttle body, pull the screws out of the throttle plate, cut off the part of the shaft that goes over the throttle plate and grind the bottom half slightly smaller. Use a countersinking bit to drill countersink holes into your throttle plate, then go to the hardware store and buy countersunk screws the same thread as the ones that used to be in your throttle plate. Install those screws into your throttle plate, then grind off the portion of the screw that is protruding beyond the bottom of the shaft.
I use synthetic 75w90 in my differentials, and full synthetic transmission fluid in my gearbox and transmission, along with an external cooler I took off a Windstar we were chopping up (SCORE!). A good set of highway tires or touring tires helps a lot with mileage over all terrain tires, but if you want something with a little grip, at least try and find a low rolling resistance tire.
Supposedly a screaming demon coil gives you more spark energy, which would mean you can gap your plugs wider. A wider gap means a more efficient burn.
Someone will come flying in here soon like a retarded superman telling you about the KKM intake, and how it is a marvelous product that changed their life, cured cancer, and made it so little billy could walk again. It is a cone air filter that is attached to an adapter plate for your MAF. It doesn't really make much difference except at high rpms (and even then it is barely noticeable). I bought one and installed it because I was going to test it since everyone wanted to argue with me that this intake is some super miraculous product that works better than any intake ever made by anyone ever..... but yeah, it is just like any other intake kit on any other car. I haven't made enough long trips yet to provide you with a reliable average for fuel economy increase, but so far, it looks like it is netting me almost 1/2 mile per gallon. It should pay for itself in about 6 years at that rate. Unfortunately the weather has been fluctuating, so I can't give you reliable information yet, but I doubt it will be very far off my initial measurements.
You can index your plugs if you have a little free time. The washers to do so aren't real expensive. It doesn't net hardly anything, except up top.... but doing it is a good stress reliever in my opinion.
Nothing that I stated above is going to make a big difference in and of itself. You
might feel a full exhaust mod, and you might feel a difference with the electric fan, especially if your fan clutch is getting old and stickier. These engines aren't real powerful to begin with, and these trucks are heavy, so you won't really make much more power anyways with simple bolt-ons, and the little you do make, won't make much of a difference. You will probably see around 3-4 mpg if you do everything I listed above, so don't expect to be making your money back on your mods at the pump any time soon.
A lift kit and bigger tires.... well no two ways about it. It will tank your mileage and the power you feel.
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What is with you people and taking it so personally every time I say that an air filter isn't going to change your two ton underpowered truck into a hot-rod?
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