I’ve seen a 2015/15reg VW Golf 1.6 TDI 110 Bluemotion with 94,000 miles and a 1.6 TDI 105 S of the same year but 72,000 miles, each £7300. Which is the better buy? Sally Armstrong, via email

If economy is your priority, the Bluemotion’s 88.3mpg triumphs over the standard car’s 74.3mpg. Both cost nothing to tax. Among the Bluemotion’s econo features are a six-speed gearbox compared with the other car’s five-speeder, plus a simple energy recovery system. The downside is that you’re paying for these in terms of your example’s higher mileage. Drive each of them, but we reckon you’ll prefer the Bluemotion’s more refined cruising.