KIEV, Aug. 17 - Russian oil major TNK-BP may have too much of an influence on Ukrainian gasoline market and further investigation will show whether the company has abused that power, the leader of Ukraine??™s anti-cartel authority said Wednesday.

In a separate investigation, the authority is trying to find out whether TNK-BP, UkrTatNafta and Galychyna, the three big gasoline chain operators, have conspired to overcharge customers.