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Welcome to EM!
I think even easier than the smooth wheel covers, would be an upper grill block? If you try it out with just tape, or some Coroplast (corrugated plastic board that all the lawn signs are made from) and tape/cable ties.
Can you post a couple or three pictures of your vehicle?
Ecodriving is the least expensive thing to do, for sure -- I would suggest starting a fuel log here, and learn as you go. Check the list of tips.
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