I suppose it depends what petrol engine you are comparing to what diesel and the difference in the cost between the 2 fuels also plays a factor.The breakeven point is higher than that I'd have thought?
With the Golf you will save up to e500 per year on tax and Insurance (comparing a 1.4i to a 1.9Tdi)
Let's say the diesel costs about e3000 more, so factor another e300 as the cost of that money. Add extra servicing for the diesel, say e200.
That makes approx e1000 extra costs involved, per year.
Now, if the petrol gets 40mpg (8.8 miles per litre) and the diesel 50mpg (11 miles per litre ) (2.2 miles further per litre) you will save 25% on fuel by running a diesel.
To break even, therefore, you will need to be using e1000 less fuel, every year. (at e1.00 per litre, that's 220 gallons of petrol)
The break even mileage, using the figures above would therefore be
44,000 MILES per year. (1100 gallons of petrol, 880 gallons of diesel, 5000 litres of petrol or 4000 litres of diesel)
quote]
These are the figures I come up with
Tax for 1.4 Lt = 292
Tax for 1.9 Lt = 511
Difference = 219 extra for the diesel per year
For my Policy with Quinn direct €79 extra insurance per year for the diesel
I would accept your € 300 cost of money for first year only. I would take an average of €233 per year over two years.
I do accept the €200 per year extra service cost
Total average extra running costs = €731
Taking 40mpg petrol @ €1.08 and 50mpg diesel @ €1.05 costs....
€0.1227/mile for the petrol
€0.0955/mile for the diesel
Diff = €0.0272/mile cheaper in the diesel
Thus the €731 is made up in 27,000 miles
Well thats how I convinced myself anyway
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