How Pennsylvania's electric vehicle use measures up

• Philadelphia County had 8,960 overall miles driven per 1,000 residents during the typical weekday.

How it works: The data, from mobility analytics platform Replica, is based on anonymized mobile device info, roadside sensors, transit agencies and more.

Zoom in: Chester County had the state's highest EV usage at 305 miles per 1,000 residents.

The big picture: Much of the country's EV use is concentrated in the "four corners" — California, the Pacific Northwest, the Northeast and the Southeast.

• Two glaring exceptions? Colorado and Hawai'i.

Between the lines: The areas with the most EV activity are generally those with better-developed charging infrastructure, as well as with higher-income households that can more easily afford the electric car premium.

• PennDOT was awarded $34 million in federal grants earlier this year to help businesses build fast-charging EV stations in 35 counties across the state, per the Inquirer.

The big picture: Electric car sales are booming, but remain short of automakers' hopes and dreams as some potential buyers continue to be skeptical about their range, performance and cost.

• Several major automakers are recalibrating their electric car ambitions after lower-than-expected sales.

• Car dealers, meanwhile, are kvetching about unsold EVs piling up on their lots, as Axios' Joann Muller reports.

Yes, but: Used EV prices are dropping fast.

• That's bad news for early adopters who hoped to skirt the law of depreciation, but a win for those looking to go electric on a tighter budget.

Plus: Automakers are doubling down on their investments in charging infrastructure to help solve range-anxiety c0ncerns.

• Mercedes, for instance, is rolling out swanky "charging lounges," while the car maker and several others are also partnering on a separate new charging network.

The bottom line: The electric car revolution is happening — it's just unevenly distributed.