29th Sep 10 I had a unit fitted to my long wheel base S class Merc in March last year. I’m retired and don’t do many long drives but yesterday I returned from Watford to Livingston and twice I achieved an average figure of 40.5 mpg with an overall average of 39.6mpg and an average speed of 63mph. This is my car’s first journey since new where this level of fuel economy has been achieved. Overall performance since your unit was fitted has been brilliant. Super power and very smooth. I have a photo of the digital display showing 40mpg being achieved.