That’s a very fortunate situation to be in. All the cars you mentioned are reliable and economical and all can fit in a set of golf clubs, trolley (and a second set) with ease. The A5 is a two-door coupe but still has a reasonable boot, however you may struggle to get two large sets of golf clubs plus a trolley in. The Audi A6 is due to be replaced very soon, while a brand new BMW 5 Series has just been launched and recently went on sale in the UK. You have narrowed it down to the best three cars that suit your requirements and there’s nothing else we could recommend that would be better. Out of the three, the new 5 Series is the best choice – it’s head and shoulders above the A6, (or A5) and E-Class. The 520d version is amazingly economical for such a big car and has a claimed economy figure of 56.5mpg while CO2 emissions of 132g/km mean tax is band E (currently £110 a year).