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In a manual with a true clutch, engine-off coasting is not a problem (even in a Hyundai). The 'clutch packs' of an automatic are a whole different kind of beast; on top of that, the Hyundai ones are a specialty type as well. They're some sort of non-standard rubber-fiberglass composite. Put in the wrong transmission fluid, and you've got a giant bowl of transmission pudding attached to your engine - the stuff in the fluid (the wrong fluids) can/will/has in the past on folks eaten/dissolved the rubber-ous clutch packs.
If you need tires, see if one size skinnier and one taller is okay. The door sticker on my Elantra says I can use 195/60 or 185/65. Town driving kills on auto trannies. Put car in N, shut down at stop lights. Fire back up as the opposing light turns yellow. That helps to the tune of 2-4 MPG. Even just putting it in N at a light w/engine on gives about a 20% reduction in fuel consumption on my ScanGauge.
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