The AA is likely to cut 300 mainly back office jobs, and create 50 new roles under investment plans, the motoring organisation announced.
Petrol sales have plummeted in the last five years, the AA have said.
In 2007, forecourts sold 22.87 billion litres of petrol but the annual figure had slid to 17.42 billion litres by 2012, Government statistics have highlighted.
Diesel sales, though, have risen slightly over the last five years, going up from 14.80 billion litres in 2007 to 16.73 billion litres in 2012.
Looking at the most recent years, the figures showed that the 2012 petrol total of 17.42 billion litres compared with 18.27 billion litres in 2011.
Diesel sales rose from 16.24 billion litres in 2011 to the 2012 figure of 16.73 billion.
Taking petrol and diesel sales together, fuel stations sold 37.67 billion litres of fuel in 2007 but only 34.16 billion litres in 2012.
The AA said that the decrease was equivalent to 35 days of fuel sales being lost since the start of the credit crunch.
Read: Petrol price rises again
Motorists received another blow earlier this week when Labour's Commons motion to have the planned January 3p-a-litre fuel duty rise deferred was defeated.
However there is speculation that Chancellor George Osborne will announce a postponement of the rise in his autumn statement next month.
The AA have said that drivers and businesses are still being short-changed, despite the threat of an Office of Fair Trading (OFT) investigation of the road fuel market.
On average, the cheapest petrol at the moment is in Yorkshire and Humberside (134.3p a litre) and the most expensive is in south-east England at 135.7p.
Yorkshire and Humberside also has the cheapest diesel (141.0p) with Northern Ireland the most expensive (142.6p).
Petrol prices have fallen but drivers are still being short-changed, according to the AA.
Average petrol prices have gone down from 138.95p a litre in mid October to 135.08p now, with diesel dropping from 143.74p a litre to 141.89p.
But the fall in wholesale petrol prices across Europe should have knocked UK pump prices down by 10p to 11p a litre, the AA said.