I purchased a 2017 RT with 40,000 miles. Before my 3000 trip this summer, I completed a major service replacing spark plugs, coolant, brake fluid, fuel lines, air, oil fuel, and transmission filter. Lately, after driving it and letting it sit for at least an hour, sometimes it is difficult for it to fire up. I turn the switch off, try a few more times, and eventually it runs just fine. This happens periodically. Has anyone experienced this? Is my fuel pump going bad or do I need to have the injectors cleaned or is there something else going on? My gas mileage is approximately 30 miles to the gallon, but I am fully loaded and travelling between 70-80 mph on the Interstate. I definitely thought that my gas mileage would get better.