The data indicates that all instances of the 2014-16 Alfa Romeo Giulietta 5-door hatchback with the specified description are equipped with a 1.4-litre petrol engine. There is consistent 100% coverage for this engine capacity, suggesting that this engine size is standard across this model and specification. Additionally, all vehicles utilize petrol as their primary fuel type, further emphasizing uniformity in the model's engine and fuel configuration.