Just got finished with grooving 2011 gmc 6.2L. This was alittle different than the 5.3 and 6.0 as it has no coolant to unhook also it is unique as it has very little room for the groove as you need to use middle bit but seemed to work great. Starting mpg avg was about 14 customer called after he got home and was reporting 14.9 as I believe he will see so good improvements as it was already starting to show some gain in just a few miles. Guys and gals don`t be afraid to do this new stuff as they are working as you know from Dan with the fiesta and the other newer vehicles I`ve done. do the mods Dan gadgetman mo.