my 06 gets awful fuel milage I get 13.4 if I keep it below 60 and dont tow anything, hook on to a 16000 lbs flatbed trailer im down around 6 and 7 mpg I was wondering if anyone has tried the flux 1 or the flux .75 and if there is a good improvement in the mileage I tried everything I can think of besides injectors, dealer was no help I tried searching and could find any information thanks for any advice