I have an EcoDiesel engine that is FUEL ONLY BY DIESEL. The Jeep is listed on my Fastrak account, just drive through a designated Fastrak lane and leave the toll amount in the middle console. The back gate is operated by a push of a button. Please do not close by hand. Other than that, it delivers a luxuriously appointed cabin; a smooth, well-controlled ride; and luxury-car levels of quietness at cruising speed.