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Start with engine maintenance, a 22.5 year old car is more like 23.5yo car. Check all your hoses, replace belts, including timing belt, water pump, clean grounds, and most of all the valve cover gasket is the easiest fix. If it's really the head gasket it isn't that hard on that engine, replace gear fluid also. You'll benefit more there first, Cd is not a constant but varies as a function of speed, if most of your driving is less than 55mph you'll see less from aero and more from mechanical. imo
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