Using premium fuel in my Volkswagen Passat has improved fuel economy and burns more cleanly.

For a while I had been sceptical about the benefits of using higher quality fuel opposed to cheaper supermarket grades. Now that I have been using Shell on a regular basis, it has cleaned the injectors...

What's causing my RenaultSport Clio to 'kangaroo' under acceleration?

I bought a Renaultsport Clio 200 brand new two months ago and am experiencing issues with acceleration, particularly from cold starts. On six or seven occasions the car seems to "kangaroo" within five...