Mechanic Mark Penta has no environmental axe to grind. Around the time this race-car aficionado did his first “Greasecar” conversion, in 2001, vegetarian transport was only beginning to assume its ...

In the span of just two years, Justin Carven invented the first waste-oil conversion kit for diesel engines, graduated from Hampshire College, drove a vegetable-oil-fueled van across the country, and ...

From the rear of an abandoned rubber factory, under the shadow of Mt. Tom, Justin Carven says he has figured out a way for Americans to save money on gas, curb air pollution and reduce their ...

Twenty states. Seventeen days. More than 4,200 miles. One tank of diesel fuel. Sound like an impossible, or maybe improbable, dream? Well, one Texas family is making that dream a reality. Timmy and ...

How would you like to fill up for free? That's what Etta Kantor does. She runs her Volkswagen Jetta on waste vegetable oil from a Chinese restaurant. Kantor had her car adapted to run on regular ...