A California woman is taking on one of the world's largest car makers in court.
Heather Peters is suing Honda, saying the company did not deliver on its promise of high gas mileage.
The former lawyer bought a Honda Civic hybrid. The sign at the dealership promised the vehicle would get 50 miles per gallon.
Peters claims she only got 30 miles per gallon.
"It went from 50 to 30 and now it is in the 20s," she said.
"If you use these numbers, and try to attain these numbers, it is going to be difficult unless you are driving just like the EPA tells you," Honda representative Neil Schmidt said.
"This is about consumers versus Honda. This is about consumers versus corporations," Peters explained.
Honda argued the small print on the label clearly states the mileage is likely to vary.
If Peters wins in court and the other 200,000 people who also bought a Civic hybrid decide to sue, it could cost the carmaker $2 billion.