The system I used was to take the road mpg of my vehicle, look at the route length in km and calculated the fuel amount as though that distance was in miles, so on a 540km piste (nouadhibou to atar) I calculated for enough fuel to carry me 540 miles at 20 mpg (worst case senario on road fully loaded), I then put on about 20% extra for getting lost! That seemed to give me plenty. for this run each vehicle had 60 litres in cans and 80 litres in the tank.

A lot depends on how certain you are of getting fuel at your destination and how easy the route is to follow, i.e. how lost you might get, that uses up a staggering amount of fuel, as does getting stuck! with 2 vehicles we also avoided putting all the spare fuel in at once, keeping 2 cans back in case we got a bit thin on fuel, then we could fuel one vehicle up to send forward to fill the cans and come back. always overestimate, never think, "hmm, I reckon that will just a bout do it"

On the atlantic route (about 450km)a couple of years back in a suzuki sj413 we used the tank of 40 litres plus 60 litres in cans, although that involved a lot of messing about towing out the 2wd cars that were with us

don't forget your water, we had 5 litres per person per day, with a 20 litre emergency supply. thats a minimum, in summer 10 litres a day if your digging or working hard is possible.

Andy
landy 101 ambie/camper
TLC H60
1968 Morris minor taveller
www.plymouth-dakar.com

and calculated that

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1990 Landcruiser H60. Full rebuild completed 2014