Engine wear - or the expected mileage out of a car is a function of mileage, nr of winters, maintenance, average RPM, peak RPM, the distribution of engine load over total engine's operating time, number of startups, minimum temperature, maximum temperature, commute distance and hours, traffic conditions, intervals between consecutive startups, quality of roads driven, altitude, elevation, air pressure, and humidity.
Add to that the impact of the driver's age, health, skill, marital status, temper, the personnality of your significant other and the number of kids. To make things worse, a lot of the aforementioned variables are mysteriously correlated with the others (a temperamental driver with a bitchy wife and screaming quadruplets might vent on the gas pedal more than a 85yo zen retired hippie).
Bottom line is that you won't get a satisfactory answer. Search the forum for mileage tales. Lot of cars driven like they've been stolen with litle problems and big mileages. Lot of stories of babied cars which kept having issues too.