P0441 EVAP system, small leak

'00 G/A, 249,000km, 3.4L V6. It's thrown this code a few times before. Sometimes the SES light will go out after w few days, sometimes I clear it myself and it's good for a while, but now it stays on consistently, even after clearing it. Is it maybe time for a new gas cap?

Yes,

The usual cause of this light is a bad seal on the cap or the cap is loose. Try a new one and see what happens.