2014 Ford Focus 1.6 Auto petrol, E20 fuel, 7lts per 100 kms = 14.28kms per litre at 40 kms per hour on average, currently paying around 34.00 baht per litre, so 2.38 baht per km on fuel.
Local Ford Main dealer maintains car, on average around 6k Baht per service, including parts, oil change every 7000 kms, had 3 services, one was a cambelt and water pump change. total cost for 3 oil changes/services 18k baht for 25k kms, around 1.39 baht per km.
6500 baht for a years insurance, top tier, in UK I would call it "Fully Comprehensive Insurance".
1650 baht for test for year.
Servicing, insurance and test = around 850 baht for a weeks motoring.
I do about 5k kms a month on average, which is around 12k baht in fuel.
To me a total cost of under 4k baht a week is about right, all in, for the convenience alone its worth it, as I'm out in the sticks.