Duster / Customer Service and Warranty

Hello, I am interested in the Duster diesel with 107 hp without four wheel and have a few questions about it: – how long does Dacia guarantee on rusting? – is the rusting guarantee extended with a warranty extension extended with? – is it important for the maintenance of the warranty that customer services were made directly at Dacia? – how expensive is a customer service at Dacia? – how often does the Duster have to ask for customer service? and generally about driving behavior – is the Duster as long distance nauto (regular motorway driving, with 130 to 140 km/h) suitable? Driving comfort? (loudness in the interior)? – I know the data from Dacia about the average consumption outside, but how high is the actual consumption on motorways, with switched on air conditioning at approx. 130 km/h or at 140 km/h ?