Electric Vehicle Road Usage Charging: Separating Fact from Fiction

As electric vehicles (EVs) become a more familiar sight on U.S. roads, the shift away from gasoline-powered vehicles has accelerated erosion of the gas tax revenue necessary for states to fund and maintain their transportation systems.

EVs are tremendously beneficial for improved air quality, energy security and long-term environmental goals. But their rapidly growing popularity is forcing states to rethink how they raise sufficient money to fund essential road work.

With cars traveling farther on each gallon of gas, and EVs using no gas at all, traditional sources of funding for the Highway Trust Fund are dwindling and can no longer keep pace with the maintenance and upgrades our roadway networks require.

That’s where the concept of road usage charging (RUC) comes into focus. The concept is simple: instead of paying for roads through taxes on fuel, drivers pay based on the number of miles they travel. It’s a modern approach that aligns more directly with actual road use, and as transportation evolves, it’s one of the most practical ways to ensure sustainable funding to keep our roads safe and operational.

The concept of mileage-based user fees is not new. At WSP, we’ve spent decades helping states explore what a fair, reliable and user-friendly version of this system can look like. From early congestion pricing pilot programs in the 1990s to today’s multi-state RUC studies, our teams have played a central role in testing technologies, evaluating policy options and engaging communities to understand what drivers need and expect. This quick video explains the concept.

Technology is available and trial programs have demonstrated its capabilities. But public perception and acceptance, particularly regarding cost and privacy concerns, remains a hurdle to its implementation.

Public discussions about EV road fees have become more frequent and sometimes unclear in recent months. A number of articles circulating online paint a picture of EV drivers being singled out or disproportionately burdened. They also fan the privacy fears that these systems will be used to track and monitor vehicle trips beyond the mileage.

But many of these narratives rely on overly broad assumptions that don’t reflect how people actually drive or charge their vehicles, or how the mileage will be compiled.

For example, previous analyses have assumed that nearly all EV charging happens at public stations. This dramatically overstates the cost picture for typical EV owners. In reality, an estimated 80 percent of EV drivers charge primarily at home, where charging is significantly less expensive and more convenient than at public fast-charging facilities. Overlooking this reality skews any comparison of road use contributions between EVs and gasoline vehicles.

Mileage assumptions matter too. Some analyses rely on annual mileage estimates for EVs that far exceed what major studies have shown. Research comparing real world driving patterns shows that EVs are typically driven fewer miles per year than gasoline vehicles, due in part to charging time, average range and common travel habits. Inflated mileage assumptions can make it appear that EV-related road fees add up to more than they realistically do for the average driver.

Likewise, comparing EV fees to fuel taxes paid by gasoline vehicle drivers depends on accurate estimates of miles per gallon (MPG). Using an unrealistically high MPG for gasoline vehicles understates the gas taxes drivers actually pay today.

When comparisons rely on inaccurate assumptions, the resulting conclusions don’t reflect real-world experience.

Rather than dwelling on misunderstandings, it’s worth focusing on what road user fees are designed to accomplish, and why so many states are carefully evaluating them.

Road usage charging offers a path toward a more stable and equitable system for maintaining transportation infrastructure. As fuel-efficient and electric vehicles continue to grow in number, a mileage-based model ensures that every driver contributes to road upkeep in proportion to their use. This aligns with the principles of fairness that many states are trying to balance: protecting consumer choice, supporting EV adoption and making sure our roads remain safe and reliable for everyone.

WSP has supported RUC pilots across the country — including California, Washington, Colorado and Minnesota — helping transportation agencies test technologies, evaluate privacy protections, analyze costs and gather input from people who would actually use these systems. These pilots have helped demonstrate that modern RUC programs can protect driver privacy, offer multiple reporting options and provide transparency about how transportation dollars are collected and used.

RUC is consistently demonstrating that it is the most viable option for bridging the widening gap between shrinking fuel tax revenues and increasing infrastructure needs, while giving states flexible tools to adapt to future transportation trends.

As with any change in longstanding public policy, questions and concerns about RUC are natural. Thoughtful and challenging discourse should be encouraged and welcomed.

The experience of states already testing these systems shows that when designed and planned well — with strong privacy safeguards, clear communication and user-friendly options — road usage charging is a practical and fair way to fund the roads we all use.

EVs are reshaping transportation in positive ways. Updating how we fund our transportation system is part of embracing that progress. Our goal is to provide clarity, technical expertise and balanced guidance that helps states make informed decisions and benefit all drivers now and for decades to come.

If you’re interested in learning more, visit WSP.com and explore how mileage-based funding models work and what states have learned from early pilot programs.