CapnScurvy and myself tested this extensively several years ago in Stock and FotRSU during the 'beta' day, and found no discernable difference between standing still and moving, fast or slow. Generally speaking, there is a difference with rpm, but the faster you go, the faster the batts charge, to a point. But, the "most fuel efficient" setting for diesel use is also the most efficient setting for battery charge, although going Ahead Flank results in a faster charge, with a diminishing return as you go above the most fuel efficient engine rpm. We did not test TMO. We have the subs set to get a good fuel economy (too good), and yet not have a super-short re-charge time, with the only way to improve that is with a "battery expert", which is one of the few active Special Abilities in FotRSU, with the "Medic" being another.
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