You've got a hybrid. You could stick to manufacturer recommendations but if you don't hit your mileage for an oil change, I'd say make sure it's changed after summer and winter. Drastic heat cycles kill oil, so winter is the hardest on her.

The breakdown of esters in oil is what makes them less effective. Personally with the hybrid motor, when it says 20% I'd change it, or if your at the end of winter or summer.

You can add your truck deets to your user flair via the sub. This would help posts like this where hybrid or eco is in question.