...at the expense of piston rings and other expensive, hard-to-get-to items. Uh, no. And, an educated guess here, probably increased emissions on the overrun

...at the expense of piston rings and other expensive, hard-to-get-to items. Uh, no. And, an educated guess here, probably increased emissions on the overrun. Also, no. Most cars built in the last 30+ years will stop injecting fuel during overrun.