my car has the same 1.6 16v engine, that also equips the logan mcv. it is a good engine, very flexible. you have 80% of the maximum torque starting from 2000rpm, so it's not a problem if you want to drive it economically. if you want to really feel the power, you need to push the pedal to the metal. the engine starts to show its power after 3500rpm (you should try 5500rpm in second gear,
- i'm really into high reving petrol engines). but i have to mention that the mcv is quite heavy, even heavier than my car. about fuel consumption, right now the trip computer of my car shows 7.4l/100km, at a average speed of 29.5km/h. if you use it only in town it wil probably show on the trip computer about 10l/100km.
usually the dci engines from renault are very fuel efficient, and all diesel engines in general, use less fuel than a petrol version with about the same hp. also these kind of engines put out more torque than petrol ones. for example 1.6 16v has 77kw(105hp) and 148nm, the equivalent dci engine, 1.5dci 77kw(105hp) has 240nm. but this engine (1.5dci 105hp) is not available yet for dacia models. so diesel engines are better for bigger loads, and sometimes more comfortable while cruising. but you have to take in consideration the mass of the vehicle. for example i have a cousin with a megane 2 1.5dci 100hp (is the older version with only 200nm), and only the urban consumption is maximum 7l/100km with ac on. but the acceleration doesn't compares with my car. i had the opportunity to drive it, and i was disappointed. in fourth gear at 90km/h, i wanted to overtake another car, and.... i had the impression that it took me about 2 minutes to do it. and in this time, i've reached about 110km/h. i was amazed (but in a negative way). the car was in fourth gear so it was in the range, where the turbo starts to work, but almost nothing. with my car if you put your foot down in fourth gear at 90km/h it doesn't take to long to reach 120-130km/h. i think the difference is made by the mass of the car. mine has 1.2t, and my cousin's 1.450t.
i also have a friend with a clio symbol 1.5dci 70hp, only in town with ac on 5.7l/100km. if you want a diesel logan mcv, I would say the 85hp version, is the best choice, because it has enough torque.
if you buy it new, you have to take in consideration a "formula". because a diesel car, costs more than the same petrol version, and all the parts and labor are more expensive than for petrol, it's a general saying that if you don't drive about 20.000km/year, is better to buy the petrol version. even if you drive 20.000km/year, you will make some economies after about 4 years.