Independent contract drivers for ABC Door 2 Door Transportation Services, a limousine service, typically travel 500 to 600 miles a day to airports in Greensboro, Charlotte and Raleigh-Durham.

Owner Tadeffe Endalk has been eating his costs to avoid losing customers, but he will have to do something to survive if regular unleaded gasoline reaches $4 a gallon.

I'm breaking even -  Endalk said.

He said that his drivers want him to follow competitors and raise prices now.

With gas around $4 a gallon, where's your profit?

He said that high gas prices have also affected his profits as an owner of several limo companies.

At the pump, the national average price of a gallon of regular gas rose 1.8 cents overnight to $3.78, according to a survey of stations by AAA and the Oil Price Information Service.

Average prices are 67 cents higher than a year ago, and many analysts say they think that they could rise as high as $4 nationwide in coming weeks. Consumers in many areas are already paying that much, or more.