The Ford F150 is the best selling car in the US by a long-shot and it's a gas guzzler. Given that, I don't think consumers care a lot about how much they pay in taxes when deciding on a vehicle to purchase.
I don't think this'd have the incentive that you're suggesting it would unless something else is done, such as increasing the tax overall.
I don't think this'd have the incentive that you're suggesting it would unless something else is done, such as increasing the tax overall.