In article , Peter
Gottlieb wrote:

I asked that when I heard about that rule and the rep told me it was not
permissible to charge different amounts for cash vs. credit, so either way
was in violation of their agreement.

What about all the gas stations that have a cash price and a credit
price?

I haven't seen as much of that in the past couple of years, but it was
common practice at most gas stations up until just recently.