Every day thousands of semi trucks crisscross the country transporting goods from one from place to another. But although big rigs are a key component of the distribution process, these gas-guzzling vehicles have never been particularly efficient. The average tractor trailer gets less than 7 miles per gallon of gasoline, making it one of the least green vehicles on the road. All told, the nation’s approximately 1.7 million semi trucks burn through more than 26 billion gallons of diesel fuel Continue reading →