We constantly hear that a national sales tax won't pay the bill. It's obvious that our federal government has become a bloated, blood-sucking monster. Aggressive and sizeable cuts in spending must happen, regardless of which tax system we operate under. The gasoline tax is a consumption tax. Mile for mile, it has provided America with the finest road and highway system in the world.
Big cars do more damage to highways and bridges.
They use more gas. The owners of big cars automatically pay a larger share of tax. In case you didn't realize it, the rich would like to spend more of their money instead of hiding it away with every new tax scam under the sun. The image of Scrooge McDuck swimming in his vat of cash and coins is funny, but fictional. So they don't spend all of their money.