I am sending you the figures related to Jaguar XF Sportbrake (2014) which I purchased new. Before adding the FTCs, I had used 928.3 gallons over 37,908 miles, giving an average of 40.835 mpg. Since adding FTC, I have used 185.26 gallons over 8039 miles giving an average of 43.39 mpg. That’s an improvement of over 6.25%. That gives 38+ more miles per full tank, which I am very pleased with. I should add that my driving style and types of journey have not changed, and the climate control is switched on all the time. Needless to say, I am very pleased and recommend the product enthusiastically.