How many miles do you drive each year? There's no point getting a diesel unless you cover lots of miles (more than 12k a year), mainly on the motorway - or, perhaps, if you need to tow something. There is a 2.0-litre petrol but it's thirsty. The 1.5-litre will suit most drivers very well. Like most manufacturers, Volkswagen is offering smaller, turbocharged petrol engines. These are usually a lot more powerful than you'd expect considering their small capacity.