Most hybrids don’t get better gas mileage than the best non-hybrids; some people for example buy a hybrid pickup truck. It does better than a regular pickup truck, but most sedans use less gas.
So why not charge people based on the EPA mileage figures for their cars, instead of targeting a particular class of vehicles?
Virginia just did this, to help pay for roads. They should just charge people based on odometer readings.
“Why did you drive so many miles compared to last year? And where did you go and what was the purpose of the trip?” “Can you justify these additional miles which caused you to emit more CO2 than your permit allows?”