Optionally, just idle it for 20 to 30 minutes with the climate controls off. Works like a charm and barely uses any gas compared to driving it.FORM is an issue I am dealing with in the south. I'm a short distance driver it's one of the reasons I got a 4xe. I knew my 90 day fuel refresh was getting close cause I filled up the day after Christmas after I made a long trip. I use E save and burn gas but it's short trips 10-15 miles one way at most and rarely. I realize now not the way to run the engine in the jeep. today I got the oil changed in the 4xe cause I checked it and it was way over full and strong smell of gas. Just have to remember I need to make longer trips to heat up the oil and do it's thing.