Drivers of Fords drop most rubbish from cars, according to a report issued by Keep Britain Tidy (KBT).
Of the 6500 littering incidents recorded by KBT since July, 1262 were reported to have involved Ford drivers. BMW drivers came out as the second worst offenders, with 318 reports, while Citroen drivers came third with 211 reports.
Regional variations were also significant, with 1289 reports from the south east and 1252 from the north west but just 668 from the West Midlands.
The most common items discarded from cars were cigarette butts and fast food wrappers.
Nearly 2000 bags of rubbish are dumped every day on Britain's roads, according to KBT.
Campaign to endorse litter-louts' licences
KBT says litter-lout drivers should get a one-point endorsement on their licence, a move that it claims is backed by 81% of people in the UK.
Dickie Felton, from KBT, said: 'Our research tells us the only way to stop some motorists from littering is with the threat of points on their licence and a fine.
We're talking to the Government to try and make it see how big a problem this is.'
More Fords, more litter
A Ford spokesman said: 'We are obviously disappointed to see our customers implicated in this way. However, because Ford has been the market leader in the UK for 30 years, there are many more Fords on the road than any other brand, therefore you would expect Ford to be at the top of any survey carried out in this way.'