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Yes, of course find alternatives to driving your car more then you have to, now lets assume that you bought it because you want to keep it, so working with what you have you should first fix whatever is wrong that is getting you lousy mileage! trying to make improvements on something that is broken is hard, if you can't find anything broken, or don't think that anything is not working correctly then are their any bad modifications that have been done? exhaust that is sized for a 5L engine for example, engine that's chipped to put out more power, in other words "race" modifications.
As part of fixing the broken stuff, do a tune up, make sure your rear end gear oil is fresh, synthetic should help too, same with the transmission and engine.
After that, start making improvements, your car is 19 years old, but just because a product claims to increase HP and mileage doesn't always mean that is the case.
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