Car insurance by the tankful?

Not quite, but California moved a step closer last month to pay-as-you-drive policies that could allow motorists to buy insurance like they do gasoline — a little at a time.

Insurance Commissioner Steve Poizner released regulations permitting and authorizing mileage verification for pay-as-you-drive, without dictating what form such plans must take.

The goal is to use per-mile pricing to entice Californians not to drive so much, thus easing air pollution, relieving traffic congestion and lowering the number of traffic collisions.

A first-of-its-kind plan is MileMeter, available only in Texas, which last year began offering six-month policies with chunks of insured miles ranging from 1,000 to 6,000 miles. When the "tank" runs dry, motorists buy more.

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