I plan to try PI out in my wife's 2006 Honda Pilot, which we bought new. It now has ~22K miles and has used Chevron 89 and Shell V-Power 93 since the first fill up. I have also used Mobil 1 5W-20 since the first drain at ~4,500 miles. I have also ordered some Amsoil 0W-20 and an EAO13 oil filter. I will report back about mpg before/after PI.