firefly, a good comparison might be what you paid upfront for your BMW, what its worth now, what the annual servicing and repairs costs are (excluding tyres) and the annual road tax to get a comparative monthly cost.
OK, a useful exercise!
A few things on the calculations:
TAX. The tax on my car is a whopping 710 euro. A newer diesel model comes in at about 290 I believe. So the extra cost to me is 420 per year.
Fuel. I get 30mpg but could probably double that with a newer diesel so I am also taking into account this extra cost to me in keeping the car I have.
I do approx 12,500 miles a year. This works out at 417 gallons a year. At 4.5 litres per gallon that's 1,875 litres per year. At say 1.30 a litre that comes in at 2,438. The newer diesel would only use half the fuel and going on a lower price of 1.20 a litre the annual cost would be 1,125. So from a fuel perspective it's costing me 1,313 per year to stick with what I have.
Servicing. I get the car serviced at 200-300 a pop every 18 months or so. Going with the higher figure, this works out at 198 per year.
Tyres are tyres and will have to be changed regardless (they're obvioulsy included in the new car cost also) so I have left this out. Ditto for insurance. The annual NCT charge does apply though. So it's .5 of the full charge, or about 23 euro.
One thing to note though. As in Bronte's case my car is practically fully depreciated at this stage, so that annual depreciation charge below will continue to drop the longer I keep the car.
Regarding the car itself, I believe its original price was circa 50k. I drove a 2012 model last year (albeit a lower spec) and I couldn't wait to get into my own car afterwards. Interestingly the only car I have driven that surpassed my own was indeed an Audi A5 for about the 50k mark too.
Soooo, here are my costings:
Purchase Price 15600
Current Value 2000
Net Cost 13600
Years 6
Annual Depreciation Cost 2,267
Servicing 198
TAX * 420
Additional fuel cost 1,312.50
Total Annual cost 4,220.17
So, my car has cost me just over 4k a year, all in, to buy outright. As mentioned this figure will fall the longer I have it.