Picked up a jug of this stuff and ran half the bottle through the 6.5 to see if it would explode ran about a 1000 miles 6.5 gas never ran better also the fuel mpg has went about 2 mpg will it remain that way ? I don't know but it does seem to be running better anyway I dumped the other half of the bottle in the 98 fuel psi has went from 5 at wot to 8 at wot which is about what it always has ran maybe even a little better than before I haven't changed the fuel filter yet I might run it awhile longer so it can ketch any junk that might be in the tank and lines