I spent around 100 months at McMurdo and various field sites, including 3 winters, even drove a few of these the first winter-2000- they went into service. The best ones would have been assigned to the NYANG and NSF staff.
There are roads about 8-10 miles of gravel/dirt roads and about 30+ miles of packed snow roads.
No salt on the dirt/gravel roads- seawater is sprayed on the roads for dust control, maybe a total of 2 weeks a year, mostly during the ship offload.
Winter use, generally the active fleet is reduced by about 75% or so. The winter staff is around 200 people, down from around 800-1000 depending on what part of the summer season.
Storage wise- they are generally stored outside, either above Winter Quarters bay or up on Arrival Heights. Inside storage space is at a premium there. They do have some old decommissioned fuel tanks that they may have been stored in but mostly the would store large equipment tires in them. Perhaps the vans with poor fitting doors may have been inside stowed but I couldn’t say for sure.
They do strictly adhere to a standard cold weather maintenance program.
The lift kits came factory/dealer installed, with the stock tires- oversized tires came down in a separate shipping container. This was due to over height loading issues on the cargo ship. These came down on the cargo ship in 2000 and later versions came down in 02 I seem to remember. They all came down on a fleet turnover plan.
Low miles- lots of hours idling mostly. Everything in both the light vehicle and heavy vehicle fleet have/had hour meters- don’t know if they were removed before salvage.
Some are in better shape than others but pretty capable overall. Check door fitment- lots of sprung doors down there due to inexperienced vehicle operators and vehicle orientation in high winds.
As far as fuel economy, no idea- it’s a full size gas powered, lifted Ford 4x4 van- may or may not have 35” tires , giant fuel tanks though. I drive 1 ton Ford 4x4 gas trucks at work so I have-no bias.
All in all a good decent platform to work from for overlanding.