It seems as though you need about 3 tanks to get the real numbers that will stay consistent. I'm judging power by feel, not timed runs or anything.

Sunoco 94: The worst mileage, and obviously no more power being as octane doesn't increase power. I would get about 500-520km per tank.

Sunoco 92: The best mileage, excellent power. I would average 600-650km per tank, more if I take it easy.

Esso 92: Good mileage, same power as Sunoco 92. I would average about 580-615km per tank.

Shell 91: Crap.

Petro Can 91: They raise prices first, won't try 'em.

Beaver, Ultramar, all the rest: I haven't tried them.

... on shell 91. I used to use sunoco 94 until this. Now I use shell 91. Shell is also one of the cleaner fuels. I don't like the ethanol blended fuels.

Kirk

They apologized for the quality of their fuel even. I just got almost no power from it.

could be B.S., but he said some chemical engineer was studying the cleaning additives and found that Sunoco's in particular are harmful for fuel lines if used constantly for over 5 years or so...if that was the case, I'm sure there wouldve been a class-action suit by now.. who knows... i tend to hedge myself and use Shell, Esso, Petro-Can, then Sunoco.

I've always run Sunoco 94 in my car since I bought it 2 years ago. It seemed to run pretty good on it. I've tried Esso 92 when I can't find a Sunoco station. Car seemed to run fine on it too. Last week, I read that ethanol blends will yield slightly worse fuel economy (2-3%) because ethanol blend is an oxygenated gasoline which contains less energy. Check out www.chevron.com for some good info on gasolines. I also heard that Petro-Can uses some good additives. So I filled up my car last week with their 91 but found the car was not as responsive. So, I went back to Sunoco 94 (which I got a regular unleaded price because they ran out of regular unleaded fuel :D). I'm going to try Sunoco 92 next time and see what happens there. I read that at one point, Esso had the dirtiest fuel but that's probably changed. I won't try Shell especially after the incident with the fuel gauge sensor. Haven't really tried any other brands.

I found that after 3 tanks, the mileage changed very little. It's like the car takes time to adjust to the new fuel.

... max km was 683km with 7L of fuel to spare, all highway. Average is around 457km with 45L of gas used, with 50/50 city/highway.

Kirk

Interesting!

We don't have Sunoco here (Calgary), so the highest octane is at Esso (92). I did try Chevron 94 while on vacation in BC, however. The mighty A4 seemed to like it, but it may have been due to the lower altitude and denser air, also.

I have Shell in my tank now. But I think I'll stick to Esso from now on.

Rich

If you stick with 94 for a few tanks, mileage will really suffer.

I don't need to explain that octane = power myth do I?

Sunoco uses ethanol as we all know. Didn't know until recently that ethanol is harder to ignite than the other gasolines - thus it does prevent preignition in that sense but the negative side is that ethanol has less energy than gasoline.

Gonna try sunoco 92 next time i run near empty and check out my mileage for a few months. I'm already getting on *average* 610km per tank for the last one year using sunoco 94 (and no I don't have a light foot).

Shell and Royal Dutch have a pretty horrid record
on that front, big questions about their reliance
on and funding of paramilitaries, use of force. I
avoid them like the plague now.

http://www.ratical.org/corporations/ShellNigeria.html

Just looking for reasons as to why their fuel didn't perform well.

Not big enough for you !!......lol

the injectors up a bit !!

Petro-Can 91.

Certainly outperforms Ultra 94 in terms of fuel economy and also seems to keep my engine / injectors cleaner; car runs smoother after six months of PetroCan 91 vs 1 year of Ultra 94.

Shell 91 kills fuel senders.

Esso used to have a horrible rep for fuel quality, and they didn't do much to quash that story.

Sunoco uses fake fuel (ethanol) which has less juice per litre than the equivalent octane MTBE fuel.

Haven't tried Ultramar for more than 1 tank.

My mom's car died of a clogged fuel filter a day after filling up at Pioneer. Don't much trust them anymore, though it was probably just one bad station.

Beaver, dunno, never been remotely convenient for me.