Or would you want to if you could? I understand the system to be tuned to preserve battery function over time. That battery is expensive. Gasoline isn't. I am fascinated by marginal efficiencies and have experienced the triumph of calculating great mileage at the pump, but it's more a compulsion than a substantial economy. The older cars at the beginning of this thread a decade ago may have benefitted from a technique adapted for a wheezy engine and modest motors. On the other hand, the IC engine in your car makes more HP than a basic Integra 30 years ago and the electric motor would itself have you beating an aircooled VW. The pulse on that is fast enough that you'd be burning fuel at about the same rate as any other normal car, and your glide would be screwed up by the automatic regeneration. If you bought your car this last September maybe you were still getting used to the car while the weather was still warm. Your efficiency when it is 10F may not seem great, but I bet you'll be able to manage 70+mpg this summer without too much focus. If you work on technique that gets you to 80mpg, and you drive a thousand miles a month, you'd save fewer than two gallons for the entire month than if you'd gotten 70mpg and driven normally.
I get it. I'm afflicted too. I indulge in more secondary road travel at lower speeds than I did before this car partly because of the difference in efficiency shown. (Though I will note that it isn't an objectively bad 80-90mph highway appliance, it isn't remarkably efficient while doing it.) I wouldn't consider it a victory of that game if posting a great mpg figure came at a much higher cost than the gasoline.
You could say the same thing about a hybrid car. Does it really save any money over the life of that vehicle in the holistic sense.
