After refueling at the gas station, the RPM won't go up. What's going on? I have to start the engine a few times to get it to work.

I've always used 95, and it seems like the mileage is about the same, right?

It's not a problem with the carbon canister. He just refueled, and it's very likely that the fuel quality is poor with too much water in it, causing the engine's RPM to not pick up.

There's an issue with the carbon canister.

It's better to go to the service station for a check or ask after-sales service. Let the professionals handle professional issues. 😄