More and more people are looking at tuning their diesels for more economy and or power.
In this day and age of ridiculous fuel prices isn't it time we had a decent investigation into the pros and cons of diesel tuning, whether it be with a tuning box or a re-map of the ECU?

I feel sure that most people would very much like to know which of the two tuning methods is the best and whether the tuning box is as bad for the diesel engine as some tuners would have us believe.

I have had diesels re-mapped in the past and have seen as much as 10mpg more which has to be a good thing especially as diesel is getting more and more expensive.