A bill circulating in California's legislature would lead to higher taxes against drivers of battery-electric vehicles and hybrid vehicles because it would replace the state's gas tax with a "road usage charge" that levies taxes by miles driven.

Senate Bill 1077 is gaining steam, because the state's legislature approved a pilot program for the mileage tax in August. Gasoline consumption has fallen in California over the past decade to 14.5 billion gallons per year from 16 billion gallons per year.

The funds would likely go toward improving the state's highways, reports Fox San Diego.