One point often overlooked when comparing running cost of Petrol V Diesel is resale when you sell it on. As mentioned the diesel was some 10k cheaper then the equivalent petrol, yet now they are 7ish K$ more, so just on this point alone the diesel was ~17k cheaper to own for the first owner - now add fuel, insurance, rego. Now no one can say for sure but I would put money on it that in the next 7-9 yrs the TD6 will depreciate less (%) then the petrol - the sums on how long it will take to save x000$ in extra purchase price on fuel don't take this into consideration.
To get an idea of how much something will cost to own (holding costs) I use basic home loan interest rates (if you don't have a home loan that is the basic income that you should be able to make on the spare $ you need to front up for the diesel)- if you finance the car, you have the higher rate to work with. So I would say a diesel is going to cost (7000 * .07 =) $490 per year extra in holding cost for the extra cash you had to commit for diesel over petrol. Will it cost 490 less to run each year? Diesel will definitely be worth significantly more (even as parts) when your done with it, so most of the 7k will be recouped, just look at diesel v petrol disco 1 & 2s.
at 11L/100 v 15 thats 36% extra, in Brisbane Premium ULP is more expensive than diesel (L322 V8 is spec for 95 Premium), so to be conservative for the PULP variant, lets say they are the same. 490/1.50(liter) = 326L of fuel. 326/36% = 905L to use for the year @ 11/100 = 8636km / year to save the holding cost difference of diesel over petrol. now add the others mentioned. I also add that I'm more likely to keep a diesel longer resulting in fewer vehicle changes.
Taking the following assumptions.
-You will get most of the extra purchase price back when you're finished with it (compared to selling a petrol)
-Premium ULP is the same cost as diesel (it's always slightly more here)
-Holding cost of 7% (not going to get 7% in cash)
You will need to drive 9000ish km / year to cover the extra holding cost. Add (guessing here) 2-3k for depreciation that will see some of the 7k vanish when you sell, subtract the other costs mentioned, being really conservative 17-20000kms would easily cover it.
I don't agree with Grumbles re fuel issues, After 16yrs of diesel vehicle ownership (we currently have 3) and a boat with a pair of diesels (fueled at marinas- generally regarded as the worst quality available), I've never had a more than 10% of the separator worth of water, and that has only been in the boat. I've picked up 2 loads of crap PULP in the trailer boat in the last 2 years, both stopped the engine, admittedly there's no damage (huge inconvenience and clean out) but I would trust the diesel more than petrol...


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