How to get 91 octane gas in an 87/89/93 area?
October 22, 2009 5:00 PM Subscribe
How can I get 91 octane gas in an area that seems to sell only 87/89/93? What sort of damage might I have caused to a new vehicle by filling it with 87 for a little while?
I recently purchased a 2009 Volkswagen CC VR6 (and am loving it). A few fill ups ago I realized that the manual & gas cover both say to be using 91 octane gas. The problem is there are no gas stations in the area that sell 91! Every station I've been to only sells 87, 89 and 93. I've been using 93 since, but I feel like I'm paying for more than I need to. Can I just half & half 89 and 93 and get a tank full of 91 - or is there a more complicated mixing method, or does it just not work this way and I'm stuck paying for 93 to get the 91? Does anyone know of a station or chain of stations in Northern Virginia (preferably somewhere along the Fairfax County Parkway) that sells 91?
Relatedly - how much damage could I have conceivably have caused by driving the first 3000 miles only filling with 87? It seems to me like the answer would be "not much, if any." I don't hear the engine knocking, I didn't feel any measurable loss of power while driving with 87, etc. But realistically what might I be looking at? Does it make sense to bring the car in for a once over just in case?
Also (love these multi-part questions); VW's Carefree Maintenance has free oil changes at 10k, 20k and 30k. Their documentation says that due to the synthetic oil being used, and the "advanced European engineering" that I don't need an oil change every 5k miles - that every 10k is fine. I'm planning to pay for a 5k anyway (until Carefree Maintenance came along, they were recommending 5k changes, so I think this 10k thing is a bit of bull) - but any thoughts on the validity to that claim?