I've been doing a little online research for the storage requirements of fuel for numbers of 20 litre Jerrycans of diesel for a high mileage diesel vehicle BBOV such as the latest Citroen model (also for fuel rotation timescale). My annual mileage rarely exceeds 10,000 miles per year.
I currently don't have a high mileage diesel vehicle such as the Citroen, but I'm thinking it might make a reasonable Bug Out Vehicle despite being a very small vehicle by US standards.
The
Citroen DS3 eHDI 90 quotes a combined fuel Economy of 78.5 miles to the imperial Gallon. It has a 10.6 imperial Gallon fuel Tank.
To stockpile enough for for say 3 months in a Emergency were fuel becomes difficult to get hold of would require enough fuel for 2,500 miles. Assuming a full tank topped off at the beginning of the fuel shortage would give 832 miles. Stored fuel would be needed for 1668 miles. i.e 21.2 Gallons.
Each Jerrycan holds 20 litres or 4.4 Gallons i.e 4.82 or 5 Jerrycans
So extrapolation, Storage would require;
3 Months - 5 Jerrycans
6 Months - 12 Jerrycans 10 Jerrycans could get you from one side of the USA to the other without refueling!
9 Months - 20 Jerrycans
12 Months - 27 Jerrycans
6 months of use of Diesel fuel storage may worth be while and not too unrealistic in terms of storage space. (although being realist even 3 months of fuel shortages i.e. such as Storm Sandy, things may have already gotten a little wild, I'm thinking more than 12 days
)