B. Breckenfeld writes:

My cars from the early 2000s had automatic transmissions that seemed to allow freewheeling when you lifted off the pedal. I used this for better gas mileage by letting the car coast when I could see red lights far ahead.

Starting about 2010, my cars produced by GM began acting more like their standard transmission counterparts by employing engine braking and downshifting as they came to a stop. This works great in mountain driving where engine braking is needed, but wouldn’t freewheeling on flatter ground allow better gas mileage?

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TTAC Commentator Pete Zaitcev writes:

Dear Sajeev:

Here’s a qustion that’s not “what car should I buy”. My town had a “snowpocalypse” event: it was 65F for a week, then an inch or two of snow fell and the temperatures fell into low 30s for a day. The usual followed, like a miniature Atlanta. But what surprised me the most was the number of broken cars parked alongside highways. They didn’t fall to accidents, they just stopped. But why? (Read More…)