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This winter I fully blocked our ZVW30 (2010 Prius) bumper air inlet and saw a 5% improvement in mileage. I'm thinking a bumper air inlet block with a valve wired with the fans or thermistor might be an answer. The trick is curving the valve edges so we don't get whistles and air noise.
The other challenge is handling bumper events. It needs to deal with minor incidents and in the event of damage, be repaired or replaced for little money. This makes the problem much more interesting.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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