Has anyone got thought on this stuff ? I put it into my X5 when I had it and my mileage increased. I only have this car a week or so. Got it serviced last week and it is giving me an average of 51.9. This is a far cry from my X5 at 23 and the last car I had a 325i Touring at 27.8 I hope it continues. Well back to my original question. Should I just buck a bottle of Dipetaine into the old girl ? Thoughts on a postcard.