Built on the Mercedes 3500 base with 6 cylinder Mercedes diesel engine. Vehicle gets between 15-20 miles per gallon depending on speed and/or mountain climbing. This vehicle has a king/queen size bed (electric couch turns into bed). Not driving it much anymore.  Mostly just to keep the batteries fresh.  Generator - 22 hrs, front batteries replaced 2018, main battery replaced 2019, Last service was 1/3/17 but I’ve only put on a little over 3k miles since then.