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Technically the battery gets a teeny bit lighter because of E=mc².

Over long journeys, those 3 nanograms really add up.

It's about a microgram.

So, in other words, you gained more mass from bugs splating on the windshield than you lost in the battery.

Don’t worry, we’ve been working on that:

But in the winter, as the cabin warms up, you have fewer air molecules to cart around.