Fulton Hanson of Minnesota is making it his life’s work to get Americans to reduce their driving speed. As the Duluth News Tribune reports:

Hanson has devoted much of his life, and $7,000 of his own money, to promote a novel concept that he says could cut energy use, help curb global warming, make the U.S. safer and less reliant on foreign oil and cut pollution. All while saving drivers hundreds of dollars per year.

The concept? Slow down.

According to Hanson–and U.S. Department of Energy mileage experts–drivers could save 10 percent or more in fuel use and costs simply by driving at the speed limit or a bit below, along with a corresponding cut in greenhouse gasses.

Hanson’s printed his motto, “Drive Easy Conserve” on 25,000 bumper stickers he’s given away at fairs, colleges and other events. Does his campaign to slow drivers down show any sign of picking up steam? Hanson admits that asking Americans to alter their high-speed habits is an uphill battle. But he’s had his moments of victory, as he told the Tribune:

“I was driving up the freeway and got passed by a car that pulled ahead of me and then slowed down. And there was one of my stickers ” and the driver gave me a thumbs-up. We bonded right there on the freeway, going 55 together. Other times I’ll look behind and there’s a little caravan behind me. People see the sticker and stay at my speed rather than pass. That feels pretty good.”

Read more about Hanson’s Drive Easy Conserve campaign at greenslowmovingvehicle.com.