The polling found that 77% of members had made a conscious decision to drive less by car or had cut back on other areas of spending, or had done both (up from 64% in April).
55% of the entire sample had cut back on car journeys, an 18% increase on the 37% who had cut their car use in the AA's identical study in April.
Edmund King, AA president, said: "There is no doubt that some people are being priced off the road."
The survey found drivers aged over 55s are most likely to have made a conscious decision to travel less by car because of the rising cost of fuel. By contrast younger drivers, aged between 18 and 24, are most likely to have cut back on other areas of spending.
The AA has noted that as a result of high prices more people were running out of petrol - the proportion of people running out of fuel and calling out the AA has jumped by 11 per cent year on year.
King added: "People who are used to putting in £20 worth find it runs out one third earlier this year. Others are shopping around for a bargain but never find one, so run out of fuel.
Older drivers (over 55s) are most likely to have made a conscious decision to travel less by car because of the cost of petrol/diesel.
10% have cut back on car servicing which is likely to lead to more breakdowns and vehicle emissions.
Drivers in London, South and Northern Ireland are more likely to have taken a conscious decision to drive less.
Drivers in the East Midlands are most likely to have cut back on spending and cut down on travel are car.
Drivers in Yorkshire/Humberside and East Midlands are most likely to have cut back on car servicing.