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But the buses’ operator, eFIS, calculates that one of their vehicles costs 50 cents a kilometre less to run than a diesel one, thanks to savings on fuel and engine repair.

According to John Miles, eFIS’s boss, the firm expects to start servicing a second route in Milton Keynes soon, adding two more charging pads and 11 electric buses to the town’s public-transport network.

Mercury Racing engine choices include twin 525 EFIs or a pair of supercharged 600 SCi sterndrives, complete with Mercury ITS with Marine Machine tie bar, Gaffrig comprehensive gauge cluster, heavy-duty trim tabs, Mercury Zero Effort throttles and shifters, and much more.

With twin Merc 525 EFIs, 90 mph is doable.