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Since you cite expenses you "can't afford" (trust me, I know how that is!!!), I'm not too sure that experimenting with an unknown like dimpled surfaces would give you very high odds for return on investment. Seems that most of what I read about the dimpled surface experiments come up with no gains, or gains too small to be statistically significant.
If cost (money savings) is your primary concern, maybe perfecting hypermiling driving style, and other things such as air dams, maxxed-out tire pressure, etc, etc. (unless you're already doing all of that, of course)
Now, if you're just dying to experiment with this dimpled surface idea for the sake of the experiment to see if you get results (believe me, I'm familiar with these types of obsessions, too), then I say "go for it" and let us know what happens.
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