There is a formula for car affordability.

1. The car must cost less than half your annual household income. E.g. to buy a $150k Honda Odyssey, you and your spouse must take home at least $300k.
2. The car must be paid in full with cash.

Once you have done that, running costs will be less of a concern.

If it matters to you, turbocharging is a moneysaving technology for Singaporeans. You can now buy a selection of cheapskate 1litre turbocharged cars with road tax of only around $390. Low insurance too. Drinks petrol same or better than a 1.5litre car and performace like a 1.5litre car.

Finally, a car is a luxury until you own one. Then it becomes a necessity - can't not have it anymore. So work hard and earn more. Remember the rules.