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Last fill-up was $3.69 for regular in Atlanta. Doubt those mirrors cut too badly into fuel economy. Were these a perfect fit - or did you have to mod any of the mounting holes or the wiring? My '98 had power and signal, but I had to replace the passenger one, and had to jury rig the mounting holes and of course, the signal didn't work. I just might junk them in favor of the ones you put on!
They don't really affect mileage at all. The one difference I have noticed is the cavitation isn't as bad when you have the windows down on the highway. They bolted right up. If your 98 has power and signal, there is a mirror option for that you just have to look at the details before you buy. You can get it with signal, power, and defrost. Had I had the time and had it been cheaper in the long run, I would've made the OE Dodge tow mirrors fit, but for the same price I ended up with a slightly more adjustable GM style mirror.