mlts22 wrote:

If you consider the MPG of a Sprinter (guessing 15 or so), it is not too bad. A MH getting 6-9 needs almost twice the volume of fuel for the same amount of miles, so in a way it evens out.

If I were boondocking with a diesel generator, I'd probably consider a cargo carrier for the rear hitch and some diesel cans (perhaps with some additives added to prevent algae from forming and maybe another additive to prevent gelling if going into cold temperatures.)

If I boondocked often, I'd consider paying the price premium for Rotopax mounts and containers. That way, it would be easy to stack a number of four gallon containers, and ensure that they are unavailable to sticky fingers with just a twist of a handle and pushing in a locking plunger.

midnightsadie wrote:

15mpg??? mine clocks over 20mpg on each tank. if you like the rv,s there great

Quote:

Auxiliary Fuel Tank: Our 17.5 gal auxiliary fuel tank is designed for the 07 and newer Sprinter Vans and our 13 gal auxiliary tank is designed for the 07 and newer Sprinter Cab Chassis and Class C motorhomes. Depending on mpg, you can extend your driving range to over 800 miles on the vans and 575 on the motorhomes! The tanks are Aluminum and act as an extension of the factory tank. There are no fuel level floats or auxiliary fuel pumps to hassle with. The tanks have internal baffles to reduce fuel sloshing and has a drain plug, which can be removed to insert a fitting for an additional fuel outlet. Installation is simple and takes about 4-6 hours. You do need to drop the factory tank and you must cut into the factory fuel tank to establish the cross over between the two tanks. Other than the fuel level dropping much more slowly, the factory fuel gauge functions normally. The last 1/4 of the factory tank registers and drops normal, and the 5 gallon reserve light functions normally. When filling the tanks, the last 6-7 gallons fill more slowly than 35 or so gallons. If you park nose down or drive down a steep incline for more than few minutes or so, fuel from the auxiliary tank (depending on its level) may/will fill the factory tank. Because of the one way valve at the fill neck just inside of the tank, the fuel will not go back into the auxiliary tank and the fuel gauge will reflect that.

The kit is special order and build time is approximately 3-4 weeks (sooner depending on our schedule). We do require a 50% non-refundable deposit to get the order started. The 144" 3500 Van tank is slightly different in length and has a 16.5 gal capacity. The 54"x12" area on the outboard side of the factory tank must be completely open and unobstructed for the tank to install properly. A 27 gal tank is available but requires installing a transfer pump and optional fuel level sending unit (call for estimates). Our auxiliary tanks are well designed and well made but are considered for off road use only. These auxiliary fuel tanks are not DOT approved. The 17.5 gal fuel tank is now available for $1495.00 plus shipping and handling and the 13 gal fuel tank is $1495.00 plus shipping and handling.