The Number Most Drivers Guess — and Overpay For

When an application asks how many miles you drive a year, most people pick a round number that feels safe. Since mileage is one of the three factors California requires insurers to weigh first, that casual guess is one of the more expensive shortcuts in the process.

Why people guess high

Caution, mostly — a vague sense that under-reporting is risky, so round up. But over-reporting isn't safe, it's just expensive: you're buying coverage priced for driving you don't do, every month, indefinitely.

Readers who want the paperwork side can follow the guide to new Job, new Commute, which lists what the DMV and the carrier each need.

How to get an accurate number in two minutes

Best method: today's odometer minus the reading from a year ago. Service invoices, registration renewals, and inspection records often carry dated odometer readings. Second best: measure your round-trip commute, multiply by the days per week you actually drive it, multiply by working weeks, then add a realistic allowance for errands and trips. Either beats a feeling.

What changes it

A new job, a move, a switch to remote work, a kid who now drives themselves, retirement. Each is a reason to update the number — and updating downward is a phone call most people never think to make. Insurers don't reduce your mileage estimate on their own.

The honesty line

Accurate means accurate in both directions. Under-reporting to chase a lower price is a false statement on an application, and applications get revisited when a claim is filed. The goal isn't a low number; it's the true one — which for a lot of drivers turns out to be lower than what they've been paying for. Requote with the real figure.

Report it in both directions

People treat mileage as something to be careful about disclosing, as though only an increase matters. The opposite case is at least as common: a commute that shortened, a job that went remote, a retirement, a second car that took over the long trips. Any of those means the policy is describing driving you no longer do. Since annual mileage is one of the factors California requires insurers to weigh, that correction is worth making — and it is one of the few updates that tends to work in your favor.