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Old 08-23-2013, 11:37 PM   #1
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Aux gas tank

Has anyone has a aux gas tank installed on their Greyhawk or Redhawk? If so where? How much did it cost you? We had a 60 gallon aux tank installed before we used our Greyhawk. The 55 gallon tank seemed small since we only expect 5 - 7 mpg. We live in the mountain west and are either going up or down.
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Old 08-24-2013, 07:27 AM   #2
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The problem with adding another tank is it reduces your cargo capacity by around 500 lbs which is about 1/2 of what you have available. Also I hope whoever installed it checked FORD's specs for adding the weight to the frame extension.
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Old 09-28-2013, 01:01 PM   #3
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They installed a subframe beef up to Ford specifications and replaced the hitch with a 7500# rated hitch. It seems that the new tank is only about 50 - 55 gallons usable however. I have yet to measure the tank but from the few fill ups I have done it doesn't seem to be 60 for sure. Having been on two trips so far I really like having the aux tank. We went to crater lake and the nearest gas was about $1 per gallon more than Costco gas in Medford. We rolled into Medford on the aux tank.
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Old setup:
2004 Chevrolet Silverado 3500 LT with a 2004 Jayco JayFlight 29BHS
2014 Greyhawk 31FS with a 2007 Tahoe toad
New setup:
2014 Thor Palazzo 33.3 with a 2007 Tahoe toad
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Old 09-28-2013, 01:08 PM   #4
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I have a 2012 31FS and cant imagine another 500# in fuel vs using the weight capacity for something else. However, everyone has different priorities.
I am getting about 6-8 mpg and run about 250 miles between fill ups. (i fill before we reach 1/4 tank) For us, I would fear extremely overloading the chasis after the wife and kids pack in all their gear.
But this does make me a little more optimistic about trying to pull a toad.
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Old 09-28-2013, 02:01 PM   #5
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We pull a 2007 Tahoe behind the Greyhawk. Funny thing GM says the loaded weight of the Tahoe is 5500# but when I weighed it with my family (2 newborns and an 8 yo) it weighed 6600# and I was not carrying any gear! I am using a Blackhawk 10,000# tow bar. It tows fine but I notice the weight on passes. The aux tank isn't 500# with fuel. Gas is about 6# per gallon. And the tank is less than 100#. So that means for my 50 gallons of usable fuel plus the tank the weight is less than 400#. When we switched from the JayFlight to the Greyhawk we made a serious evaluation of what we really needed to carry. In our old setup we stored stuff for all seasons. We don't now. I'm trying to manage to GCWR and GVWR. It is a bit of a challenge but it can be done.
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Old setup:
2004 Chevrolet Silverado 3500 LT with a 2004 Jayco JayFlight 29BHS
2014 Greyhawk 31FS with a 2007 Tahoe toad
New setup:
2014 Thor Palazzo 33.3 with a 2007 Tahoe toad
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Old 09-28-2013, 03:46 PM   #6
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We live out west and with the mountains the standard tank won't last very long. On the flats it is very good. We were able to get from Corvallis OR to our home just outside Seattle on less than 1/2 tank. True we had a stiff tailwind and no traffic. I also kept our speed down to a reasonable 60 - 65 mph. Unfortunately up hills all bets are off.
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Old setup:
2004 Chevrolet Silverado 3500 LT with a 2004 Jayco JayFlight 29BHS
2014 Greyhawk 31FS with a 2007 Tahoe toad
New setup:
2014 Thor Palazzo 33.3 with a 2007 Tahoe toad
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