My exhaust project takes one step forward and 3 back, saw some neat full exhaust systems at delkevic.co.uk, anyone got experience with em?

So i did a short trip of 91miles/148km,  not wotting or city driving, and my mpg was 33mpg&7L/100km?? Damn that sounds terrible, what ive read here people done 50-60mpg. With city drive and some wots its easily 23mpg. Could it be the dj kit, even tho it tells that mpg should be better with it

So i did a short trip of 91miles/148km,  not wotting or city driving, and my mpg was 31mpg&7L/100km?? Damn that sounds terrible, what ive read here people done 50-60mpg. With city drive and some wots its easily 23mpg. Could it be the dj kit, even tho it tells that mpg should be better with it