Not necessarily more reliable. Also I can add from personal experience the e46 diesels are more economical than the e90 diesels. Stock for stock and mod for mod.
I dont know how but on the same routes, conditions and me as driver I keep getting the same result.
yesterday had to go to bela bela in northern province,ther and back with a little bit of town driving in Pretoria got an average of 6.2/100km.works out to 16.12 km on a liter,not bad for a performance car:rollsmile:
note I did do some wild pull offs from toll gates just to have some fun