My girlfriend is very keen to purchase a Fiat 500 Lounge. She will cover 12-14,000 miles a year of which two-thirds will be motorway commuting, the rest city driving. I am not sure which engine is best to go for. The 1.2 seems adequate, the Twin-Air intriguing, fun and more powerful (albeit the dealer says often heavy on fuel), the 1.3 diesel perhaps suitable for the motorway, but I am not sure about reliability and whether the mileage will justify the £1400 price premium over five years.