Originally Posted by Dwight Frye

I have been running nothing but ARCO in my Z and G35 before that and a couple of other cars before those with no problems or poor performance at all. It's BP gas if I recall. We have about the highest gas prices in the country here in CA, I paid $4.74.9 last week for 91 Octane and I need all the price break I can get. Arco is the least expensive "name brand"
I do not buy from the no-name "Thrifty Gas" stations.
Regarding additives, I add 6 oz of MMO (That's Marvel Mystery Oil for those of you in Rio Linda) to a tank every thousand miles, and a bottle of Techron to the tank before each oil change. These seem to compensate for the additives that Shell or Chevron add and I come out ahead in the long run.

The MMO is good for the lubing the upper cylinder area, fuel pump and sending unit in the tank, which helps prevent the erroneous fuel level readings that many report, and the Techron cleans the injectors with a high dose of PEA.