I was tight for an appointment. I always start whatever vehicle & let it idle while I set up GPS & fasten seatbelts... The Cirus just shut off. Refused to restart although it turned over fine. I grabbed my stuff, GPS, fired the CTD up & away I go. I was ON IT to make up time, so I'm sure I screwed up mpg. I hit WOT a few times & the low restriction exhaust definately is louder. I made it on time. I "old lady" drove the CTD on the way back to earn back some mpgs... I tried restarting the Cirus. It seemed like it wanted to start but really wasn't firing at all. About the third try, I got one cylinder to kick in & ran the rest of them into operating. I don't get it...Russ