What octane gas do you run?, Is higher always better ? Or just a waste of $$$ Options

[Michael N]

I was wondering what most drivers are using in their 914's. 87, 92, 100?

I have heard that in fuel injected cars running with a higher octane gas than they were designed to run at can be a waste of money since they are set up to run on a specific octane and any more is lost. I have a Passat and the manufacture states 92 octane. My truck uses 87 and the dealer said I can do damage by running 92 ( although I have no idea why).

Please set me straight on my ignorance. (IMG:style_emoticons/default/sad.gif)

[rjames]

He told me that in my area they sell double the amount of 87 octane than that of 93, especially due to the current and recent gas prices. The more often the tanks are filled the greater the opportunity for impurities to be transferred from the tanker trucks into the tanks at the station..

Couldn't the opposite be just as true? (Assuming that they don't clean out the holding tanks at the station.)

If a holding tank for 91 octane does get filled with gas that has impurities, then that gas sits in there longer (as people don't buy it as much). Therefore it's possible that it could actually increase the chances that your buying a tank full of gas with impurities as apposed to the low octaing holding tank that is being refilled more often. I guess you'd have to factor in how often you by gas vs how often a holding tank is being refilled.