>their gas cost savings estimates are actually quite low compared to the real savings you will achieve

I ran the numbers for myself and they literally weren't. They overestimated how many miles/yr I drove and underestimated how much I pay for electricity. There's plenty of other reasons to prefer EVs, but if you live somewhere with expensive electricity then fuel cost isn't one of them. In the sedan world you're likely better off with a Prius but even small SUV are getting 30-40 mpg nowadays.

As an asterisk, I live in California where gas prices are ~25% above the national average but electricity costs are more like double/triple. YMMV which is why you shouldn't trust Tesla's numbers or anyone else's except your own