The average American driver gets about 25 mpg and drives about 15-20k miles. That's exactly in line with the tax rate here.

The average American car does not drive 20k miles. 12,500 is the average yearly mileage.

And it's an EV, a closer comparison should be something more like a hybrid. It's not a giant truck.

But it weighs as much as a giant truck

It weighs about as much as the smallest base model F150. Optioned out models and other trim levels easily hit 1,000lbs+ heavier.

Meanwhile that base model equivalent weight F150 gets about 24mpg and thus pays about half as much gas tax while doing the same amount of damage driving the average mileage. Further proving my point, I pay twice the state fuel tax for an equivalent weight pickup truck. Is that fair?

But also, isn't the whole point of the pickup truck to load it down? If all it's doing is carrying 1-4 people it's whole life, seems like a lot of waste. I'm told people buy trucks to actually load them down a lot and not just commute and get groceries? So while it's about the same weight dry and unloaded shouldn't it's weight really be quite a bit more in practice? Or are we all agreeing now trucks are just for commuting and getting groceries?

Seems unlikely.

55 miles/day, 365 days a year? Also, look at lease mileage limits.

Now you've moved the goal posts to about half of your original claim. And it's still not accurate (links have already been provided elsewhere in this thread). And the only thing I've owned in the last 30 years that gets 25 mpg is a camper van (and, no, that thing doesn't move anywhere near 15K miles/year).