LACROSSE, Wis. – The rules are changing at Kwik Trip, the major purveyor of gasoline fuel in the region. Beginning January 3, drivers will need to pre-pay either in cash inside or with a credit card at the pump. No more pump now, pay later. Clerks found themselves preoccupied monitoring outside pumps for drive-off  abuses, which diminished the attention they could give customers at the check-out registers inside. the company said. Customers at diesel islands, which include big rig-trucks with mammoth fuel tanks,  will still be able to pay inside, the company said.