Better gas mileage

What are some tricks of the trade to improving gas mileage without limiting performance? I know a weber (or equivalent carb) will help but what about some other things? What are you guys doing?

tonneau cover

Keep your engine tuned up. Incorrect fuel ratio, bad spark plugs and incorrect spark timing can have a big effect on gas mileage.

Don't use your air conditioner (A/C) unless you really need it. The A/C compressor puts an extra strain on the engine.

Make sure your tires are properly inflated. Under inflated tires cause more resistance to travel.

Avoid stop and go traffic by taking alternative routes or less congested travel times.

Ask other people with the same type of car what kind of gas mileage they get, it may alert you to a problem with your car.

Use a good engine oil, preferably a synthetic or standard oil treated with a friction reducing oil additive. These have been known to improve fuel economy by as much as 12%.

Reduce the weight in your vehicle as much as possible. (Good excuse to get the mother-in-law out of the car....)

Use your cruise control whenever possible.

Keeping your highway speed at 55 mph can improve you gas mileage by as much as 25%, compared to 75 mph. (Yeah, I know--this one's tough for us too)

Avoid trying to increase speed while climbing a hill, your engine is already working hard trying to overcome gravity.

Keep your windows closed when possible. Open windows actually reduce gas mileage compared to using the A/C.

Remove accessories, such as luggage rack, etc. that lower the aerodynamics of your vehicle.
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You forgot to add.. Don't drive it. that is the ultimate saving...

I'm talking about engine modifications such as a new exhaust manifold, etc.

weber, electtric fan, mx6 pully swap, pacesseter header

I've heard about everything except the MX6 pully swap. What does that consist of???

I can't even fill the tank up more than 3/4 in my truck and I'm still rockin over 450km per tank bone stock with a poorly tuned and tired motor. My GPS is my trip meter and speedo so I know it's accurate.

An electric fan is probably one of the best mods you can do.

The e-fans from a Ford Focus fit perfectly.

mx6 pully swap consist on removing rotational weight of the crankshaft which will free up some horse power, with the e-fan mod and pully swap ur gonna be removing about 12lbs that the crankshaft has to move

and on a mazda, that's A LOT

Cool, I have an extra electric fan sitting around the house here. I've already removed the catalytic converter. Do you think that I'll see much of a benefit with a header?