This is the link to the article. http://autos.yahoo.com/articles/autos_content_landing_pages/...

Seems like they are complaining about the charges that they get from credit card companies for people using cards to pay for gas.
The higher the gas prices go up and people paying with cards, the higher fees they get.

Gas station owners paid over $7 Billion in fees to credit card companies and only made over $3 billion in profits.