Take your car on a long Sunday drive every now and again. I doubt short trips have anything to do with it being progressively more difficult to start, but frequent short trips are definitely harder on any car. Highway miles are much more kind, unless you habitually hammer the gas to get up to speed. And I wouldn't just sit and rev the engine; better to just let it idle for a few minutes, if you must. All in all, if your temp gauge reaches near-halfway, it's probably not a concern.
Ever notice the water dripping from the tailpipes when idling a cold engine? If the exhaust never gets good and hot, that water stays inside your exhaust system.
dcb
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