From a friend.
He uses his CC to buy small amount ($ 50) gift card at gas station, and get gas CC rewards. Then the gift card is used as cash to buy food and receives gift card rewards. This works with any CC with 3% or 4% on gas. I’m sure a $ 100 gas station purchase does not look right.
Sounds like a good plan. The gift card can be used to buy gas, but carries no rewards.