Me and my girlfriend bought a 1989 micra as our first car last year. We drove it from sweden to Croatia and back. No problem at all
(thats 2500 miles in total.)
drove at approx 75 mph as max speed.
The funny thing is that my girlfriends uncle talked to her about how crazy we where in doing that trip in such an old ####ty car.
later that summer he and his wife took a trip down to germany in his 2004 SAAB. suddenly it just stopped, the Gasoline pump was totally busted (dont know if its called that in english). they had to wait a week for the spare parts to be flown down to Germany from sweden, We where home in Sweden at the time and called him and asked if he wanted us to come down and pick him up with our micra
SAAB was pretty cool about it and actually swapped his entire engine for a brand new one when he got home to sweden, for free.
I guess any car can break down. So you never know
We bought our micra really cheap from an old lady who was the only owner of it. We drove like 8000 miles (13000 km) with it the first year and it passed the MOT without one single error!
before we did our long trip we had it serviced by a mechanic who is a good friend of my GFs father. the mechanic actually said that these types of engines are better suited for long runs than start-stop travells. so he adviced us to drive as long as we could, then just stop, rest, eat, then travel for a long while again. We could actually feel the car running better and better during the holiday, i guess its good to "clean the system" with long drives on the motorway at a pretty even speed.