I'm currently deciding on the make/ model and fuel type of my next car and to be honest it's a bit of a mine field with the current fuel prices. I honestly can't put much daylight between petrol and diesel. If you're running 97+ RON petrol it's not far off the same price as diesel. But obviously in a similar size engine the diesel is going to be the more economical and when you're talking about engines like Audi's 3.0 TDI and BMW's 335d, there isn't much loss in performance by going diesel either. However, i hear today that diesel is set to go up in price AGAIN, maybe to £1.35 a litre. Is it ever going to plateau or just keep going up til diesels aren't economically viable anymore?? So what are the opinions on this? If you were looking at buying a car to keep for the next 3 years would you go petrol or diesel? Which is going to give you the better economy return overall in the coming years, while balancing against driver pleasure and overall owner satisfaction? I know petrol vs. diesel has always been a hot topic but i think it applies now more than ever seeing as there is becoming so little difference between the two both price and performance wise. I'll be interested to hear the opinions.