But the DECC report, compiled by consultants Deloitte, concluded that UK retail sector had "more than enough capacity to meet fuel supply shocks until contingency measures can be put in place".
Ministers say the training of army drivers will begin next week as part of contingency plans being drawn up to avoid major disruption to fuel supplies.
The companies, which support the strike, say their contingency plans to ensure supplies of basic goods have been disrupted by fuel shortages and government ineptitude and harassment.