I do roughly 15k a year now and it is still cheaper for me to run a petrol car at 39mpg than a similarly powerful diesel at 45ish mpg.
Well we have 2 diesel cars in the house, both have dpf's, only one has a dmf and had no problems with either.
With regards to savings I don't know where countryroads gets his mpg figures from. My car is a BMW 118d, it averages about 48 mpg. Was loaned a 118 petrol for a weekend when mine was waiting for a battery (warranty) and we got 35mpg on the dash but experience tells me that lies and if it lies as much as the 118d that is probably nearer 32mpg. I do 7,500 miles a year approx, diesel costs me about £980 a year, petrol for the 116 would cost me about £1,400 a year, £420 more. I also save £100 a year RFL, thats over £500 a year. Not a huge amount but over the 5 years I have had the car its £2,600. Servicing is the same for both. Car cost me £300 more when new over a 118 petrol but its worth over £300 more now.
Wifes car is a Kia Ceed SW. She does 10,000 miles a year and it averages 52 mpg, diesel cost £1,200 a year. The petrol versions appear to average about 35mpg based on the moans on various kia websites, over 10,000 miles that's about £1,700 a year. So she saves £500 on fuel and another £100 on RFL, total £600 a year. Car cost £1000 more than petrol but although it will be worth more come trade in we won't get it all back, I expect about £500 extra. Servicing costs identical. Savings over 5 years £2,500.
So on an average mileage we are making good savings, if we were higher mileage motorists we would save a lot more.
I dispute that petrols are smoother and quieter than modern turbo diesels and any modern turbo diesel is way better to drive than a modern petrol which tends to have little power at motorway speeds when you need to change lane. Prefer turbo diesel power when overtaking on A roads as well.
Each to their own but at present I will be keeping my diesels.
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