[Humdizzle]

^ im guessing his commute is 30 miles to work and 30 miles back? so double your cost estimates.

it doesn't make sense to keep the 340i around if its not your daily, its not that special of a car where low miles are gonna keep its value up or make it sought after. if you're not romping on it you can put 89 octane in their most of the week and 91 once a week or something to trim costs. the ecu will adjust.

have you considered a diesel BMW ? not sure what offering are there in south africa. UK gets the 330d option with 480 lb-ft of torque. The old e90 335d we used to get here in the US could get like 36mpg+ on the highway. diesel is more expensive though. but it should save you money overall if you're mostly on the highway.