BMW Z4

If you’re worried about running costs, then stick with the entry-level versions of the Z4, as they’re cheaper to buy, run on less expensive tyres and come with lower insurance costs. Nonetheless, any sporty rear-drive sports car with a soft-top will attract a significant premium from the insurers. Version-for-version, the various Z4s are fairly economical if you don’t push them too hard too often, certainly in comparison to their petrol-powered rivals, but BMW does not offer a diesel version like some rivals do. Naturally, the M40i, with its large engine, uses more fuel than the other models in the range. However, the Z4 should retain its value well, helping offset some of the running costs.