I just got off the phone with David Havanich Jr., president of Green Machine Solutions, a company in Jupiter, Fla., that promises to increase your car’s gas mileage by as much as 60 percent. The ...

PALM BEACH COUNTY, Fla. (WAVE)-- With gas prices rising, the squeeze on people's budgets is getting tighter. So a device that could double your vehicle's miles per gallon would be great. That's ...