The cuts are tiered by engine size. In the very first year, cars above 3,000cc petrol or 2,500cc diesel get a quota of 10,000 units at a reduced 30 percent duty, down from 110%, while smaller cars up to 1,500cc see duty drop from 66% to 50% on a 5,000-unit quota. By year five, duty on the largest engines falls all the way to 10%, and that’s where it stays, the agreement doesn’t push it any lower beyond that point.