DOes anyone notice any differences in their MPG depending on which gas they use? When I was in the Navy, I was stationed in Orlando for a bit over a year, but I was from San Antonio (which is where my gf was :)). I used to drive from FL to TX once every couple of weeks for a night or two (24 hrs each way, I would do it non-stop), and being I was enlisted and poor as hell (hence no flying), I used to experiment with using different types of gas to see if what the difference was. I had enough distance and enough trips to rule out environmental differences I think, and at the time Phillips 66 was 3-4 MPG more than anything else, and I think Shell was second.
That was 10 years ago, so I think I will try it again now, and depending on my results I will post a new thread and see if anyone else want's to play.
On a side note, BP is the only station here with 92 octane, but is not top tier, lame! On the other hand Stehpen Kasper from Imagine Auto here (Porsche and Audi guru) only uses BP in his 997TT when not using race gas (if he even uses race gas, I never asked), and I trust his opinion:
Not bad performance numbers on his car after his mods either, and it is his DD, I have seen that with my own eyes as he gets to work in the AM:
Typical Performance data
Times | Stock | iAV-5 EVT700 Package
0-60 | 3.9 Sec | 2.9 Sec
0-100 | 9.8 Sec | 6.8 Sec
60-130 | 12.8 Sec | 8.1 Sec
1/4 mile| 12.22@117MPH | firstname.lastname@example.orgMPH