Here in SE Michigan, one local transit authority ditched its new hybrid busses and returned to diesel ~15 years ago - because the TCO for the hybrid busses was so much higher that fixing the hole in their budget proved impossible.
Sticker price on a hybrid bus was a few $100K higher than on a conventional, the actual mileage wasn't all that much better, and the maintenance was considerably more expensive. My source didn't mention reliability - but it's a big enough system that they'd track that as cost, too.
("ditching already paid for" - probably not the case. Vs. leasing, or selling the hybrids on, or something.)
