Cleaning is more about getting road salt, and general dirt off the undercarriage. Potentially that reduces some extra weight, and less weight equals further EV range. Will the increased range be noticeable? Probably not. So having a clean bottom is nice (especially for a mechanic working under the car) but I would not spend money on having the dealer do it. Many car washes have an undercarriage wash option. Or, do it yourself. I use a garden hose with a 3 ft wand with the head set to a wide pattern spray and move it back and forth under the car when I wash my car.
My understanding is that the faster the vehicle is moving down the road, the greater the influence the car’s aerodynamics has on the fuel consumption efficiency, i.e., the more aerodynamic the car, the better the mileage at the higher speeds where this factor is important. The less time the car spends at high speeds, the less overall impact obtained by tweaking the aerodynamics.
IOW, a clean undercarriage may improve air flow. At freeway speeds, a clean undercarriage may add perhaps a small fraction of a mile to the car’s all-electric range, but what proportion of your driving is done at freeway speeds?
If the car in question is a Gen 1 Volt whose owner replaced the original tall air dam with the shorter version because it kept scraping on those blankety-blank speed bumps, then I speculate the reduction in ev range caused by the use of the shorter air dam is far greater than any increase in range that could be achieved by cleaning the undercarriage.
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