I'm trying to help my brother-in-law buy his first car. He's in his early thirties, has little interest in cars and just wants reliable transport with a low insurance group. He mainly lives and works in London but is developing a career as a musician and is doing a mini-tour of some UK cities shortly, so needs a multipurpose small car, ideally with decent boot space. His budget is around £6000 and I've suggested a 2012-2014 Hyundai I20 or KIA Rio so he can benefit from 2-3 years remaining manufacturer warranty. The Rio seems to have a more upmarket feel and the longer warranty. First question is would you agree KIA warranty is worth chasing, and secondly which Rio version to go for? The diesels give better mpg but I'm worried about DPF problems and possible city bans and higher taxes on diesels in future. Only the smaller 1.1 CRDi seems in budget. We've discounted the 1.25 petrol for motorway work as only has 5 speed gearbox. So would you advise 1.4 petrol (higher tax & insurance, lower MPG), 1.1 diesel or try to stretch to a 1.4 diesel? Finally is it worth considering 1.4 diesel or petrol Kia C'eed as these are Group 7 insurance like the 1.4 Rio.