By Tony Bizjaz, Sacramento Bee
 
Weeks into a new gas tax hike, California transportation officials said Thursday they are studying ways to charge drivers based on how many miles they drove since their last fill-up rather than the amount of fuel they use.

The problem? California drivers are choosing such fuel-efficient cars that the state fears it will be deprived of enough road construction revenues in the long run.

The Caltrans study – the California Road Charge Pilot Program report – is billed as a way for the state to move from its longstanding but outmoded pump tax to a system where drivers pay based on their odometer readings.

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