Little info taken from latest 4wd book.
The Petrol vs Diesel debate.
Assuming will own vehicle 5 years and averaging 20,000kms a year.
2002 GU Patrol 4.2 Turbo Diesel
Purchase Price: $29,990
Estimated Value after 5 years: $15,000
Depreciation per year: $2998
Insurance per year (average): $1450
Rego per year: $1100
Fuel costs per year (@14L per 100km, Ave $1.50 /L) : $5250
Servicing costs (5000km Intervals)
Oil : (11 litres @ $8/L) $88 x 5
services = $440
Oil filters @ $30 x 5 = $150
Misc Filters and oils = $400
Total Cost to own per year: = $11,788
5 Year ownership plus purchase price= $73,930
2002 GU Patrol 4.8 Petrol
Purchase Price= $26,990
Estimated value after 5 years= $11,000
Depreciation per year = $1490
Insurance per year (average) = $1490
Rego per year = $1100
Fuel costs per year (@ 18L/100km, Ave $1.50/L) = $6750
Servicing costs (10,000km Intervals)
Oil (10 L @ $7/L) $77 x 2.5
services = 192.50
Oil filter @ $12 x 2.5 = $30
Misc Filters and oils = $300
Total cost to own per year = $13,060
5 years ownership plus purchase price = $81,290
So there it is, after 5 years Diesel is already the winner.