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Dave Cooke

About the author: Dave Cooke is a vehicles analyst in the Clean Vehicles Program, specializing in both light- and heavy-duty fuel economy. He conducts research on fuel efficiency technologies and the implications for oil consumption and greenhouse gas emissions across the transportation sector. See Dave's full bio.

Diesel vs Hybrids: The Costs and Benefits of Both (And a Shiny Calculator!)

If you’re thinking about buying a vehicle, chances are you’ve noticed a number of automakers touting the benefits of new “clean diesel” vehicles with fuel efficiencies of 40 to 45 mpg on the highway. That sounds awfully high – but what does it mean, and how does it compare to the most efficient gasoline-powered vehicles on the road, hybrids? Read More

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Driving a Tesla Model S: A Glimpse into the (Electric) Future

This past weekend I had the opportunity to test drive a Tesla Model S, and it’s an amazing car to drive. Its luxury and high performance has won it accolades like Motor Trend’s 2013 Car of the Year—but the inherent benefits of being an electric car are what really set it apart.

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Is that Truck Wearing a… Skirt?

As you find yourself traveling on the road these holidays, you may notice something different about tractor-trailers—some of them are wearing skirts. Because of the roughly 100,000 miles traveled annually by the average long haul tractor-trailer (ie semi-truck, or big rig), putting on one of these long skirts (pictured below) is like eliminating the global warming pollution from an average car. Here’s how, and why we need more of them. Read More

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