Your gas car works fine. Consider an EV anyway, scientists say.
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- Elliot Campbell's study, published in Science, found that swapping even a 2-year-old gas car for a new EV yields a lifetime emissions savings of about 50%, and that benefits grow the longer the EV is driven.
- The study was deliberately tilted toward gas cars by ignoring the manufacturing emissions of existing gas vehicles as a sunk cost; EVs still came out ahead.
- David Reichmuth of the Union of Concerned Scientists, who was not involved in the study, said EVs hit their emissions break-even point at roughly 18,000 miles — what the average driver covers in about 18 months.
- Where the grid is cleanest, the payoff is dramatic: in upstate New York (hydroelectric-heavy), an EV performs like a 219 mpg gas car; even in coal- and gas-dependent Rockies, an EV beats any gas car getting under 68 mpg.
- An EV must be driven 4,400 miles per year (car) or 6,700 miles per year (truck) to repay the carbon debt of its manufacturing — both well below the U.S. average of 12,500 annual miles.
- Campbell and his co-author identified two exceptions where switching doesn't pay off: plug-in hybrid electric vehicles (with larger batteries), and low-mileage second cars like a retiree's occasional-use Prius.
- Moaz Uddin of the Great Plains Institute and Reichmuth pointed to scrappage incentives as the most direct policy lever; the 2009 federal "Cash for Clunkers" program paid $3,500–$4,500 per vehicle and exhausted its $3 billion budget in one month.
Why it matters: The finding inverts the common consumer intuition that keeping an older gas car is greener than buying a new EV, meaning climate-conscious buyers gain nothing by waiting. For policymakers, the study points squarely at scrappage incentives — proven to clear budgets in weeks, as the 2009 "Cash for Clunkers" program showed — as the most direct way to accelerate gas-car retirement.
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