I doubt the wife's pickup has any deposits. She has run Techron and Lucas for over a year messing with that slight ping when she drives up the overpass. She fills at a half tank with the 87. Then the next tank she will fill with the mid octane gas. That eliminated the pinging. The results are faster cold morning starts, better acceleration. She said she picked up a little gas mileage.

Strange how increasing the octane in most engines is a waste of time.