I have a range of 620+ miles with my 2007 ML320 CDI. Somehow, I think you can find a fuel station with that range.
When I first got the car in October of 2006 and drove cross country from Indiana to Arizona, the "new" diesel fuel was sparse. I looked for Ford dealers as they sold diesel pickups and there would be a diesel station with the "new" fuel nearby.
Most Chevron stations have diesel fuel here in the Phoenix area of Arizona. Be aware that Love's truck stops are now carrying up to 15% bio-diesel which is more than either my 2007 MB or 2012 Ram 2500HD can handle without damage.
I have nearly 115,000 miles on the car and it runs well. One might say the engine is just broken in. As a treat, I replaced the accelerator and brake pedal rubber covers at 100,000 miles as they were worn.
The Albuquerque MB dealer I stopped at on the trip over to Arizona in 2006 said the brakes would only last 20,000 miles. Since I use the paddle shifters to drop gears for engine braking, I did my first brake pad replacement (with over 15% left) at the 100,000 mile point. Ask to see the old brakes pads after the service to be sure you are not scammed. Be aware some dealers replace items early for creative sales.
You will have to live with the "DEF" fluid. You can get it at any automotive shop and not pay MB $250 for the service.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels