a few of my customers stated they switched to royal purple in their vehicles and gained anywhere from 2-6 mpg. now mind you, these are reliability engineers that are around rotating equipment (refinery pumps) all day long, so they are not stupid, they know their stuff and how machines operate.
what do you guys think? anyone that has used this stuff in our tacomas?
edit: just to be clear...one engineer said he gained 5-6 mpg on his older camry, one said she gained 4mpg on her rav4, and the final engineer said he gained 2-3 on his tahoe. this data is coming from people who track trends and reliability of machinery at a local refinery, so they know their numbers!