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Keeping the car washed and waxed as stated above will keep the car looking nice, but wont help with FE. The boundary layer is far thicker than the fraction of a millimeter that dust is.
Also be careful switching to synthetic oil, it has smaller molecules than conventional oil and will make any leaks worse. This is especially true for high mileage motors. Even if you dont see any leaks, switching to the synthetic might cause some that werent bad enough to let the conventional out, but will let the synthetic out.
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