If you like to drive more on the open roads, 110PS is a better option for you, as there is a lot of torque is available to use past 1750RPM and you can easily do 160 kmph on the variant. However, turbo lag and a bit hard clutch makes city drivings tad hectic.
PS is the German unit of power, 85 PS means that this car generates 85 PS of power and RXE is the name of the variant. It has got a 110 PS variant also which means that the engine is tuned to generate 110 PS of power.
The petrol variants of Duster and Terrano return a low mileage of around 12-13 kmpl, therefore it is advisable to go with diesel variants. Also, the K9K diesel engine performs better than the 1.6-litre petrol engine.
The procedure of procuring the keys for Renault Duster is a lengthy one. You would have to place a request with Renault service center. A technician would come to your place and unlock the steering and tow it to the service center. Your old lock would be replaced with a new one and new keys would come in 15 days. The cost of the keys would be Rs 4,500 per key. You would also have to take your RC booklet and Insurance papers to your service center.