With the limited miles I've put on it, I'd say it does run warmer in stop n go traffic. To put it in context, I've been stuck in stop n go traffic only once, and that was coming home from Greg's the day we fired it up, with 0 miles on the engine. That day, the needle started creeping up to the upper ranges, then dropped again when I got past the snarl. BTW, there's no aftermarket gauges installed, only OEM.