Well, I looked at the code. Not that much to clean up. I squeezed about 24 bytes out. (String outputs.)
The cDA/cRR would be interesting, but how often would you use it? I could see making a separate program that would run in the same hardware setup (write down the hard earned variables for your car first.) That could do more diagnostic things like 0-60 and cDA/cRR that may be more memory intensive. Perhaps adding in a neutral sensor (auto), or clutch sensor (manual) and work out effectiveness of pulse and coast over a trip.
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