Dnasty

I know it says premium gas only but does everyone actually use that? Just curious I use premium and still get all the popping noises after a long day of driving.

Plutoe

you oughta drive a diesel!!

Dnasty

I only put diesel in it when I plan on going far.

sheepdog8

We alternate filling up with tanks of 89 & 93, to save a little $. No probs at all. I used to do this with my 99 A4 1.8t also.

Figuero

+1 on mixing it up. I used to use only premium but ever since the oil companies started gouging on premium I shop around. Standard practice used to be ten cent increments between grades. These days regular is a loss leader and the poor saps that buy premium are getting hosed at the hose.

track_warrior

93 octane only in my w210 E-420 since the first day of ownership. I also use a fuel system cleaner additive every 5k miles.

desired_speeds

I use 91 octane of whatever mainstream brand that is convenient for me which usually ends up being Chevron.

livetodrive

Most of the time I fill up with 93 octane, because it's the only premium grade carried at Sam's Club. When I'm on the road, I prefer to put in at least 91 octane, but if it's a choice between 89 and 93 with a big price spread, I've put in the 89 without any problems.

Strigoi

What she said.

desired_speeds

Musikmann

I always use one of the top tier fuels. It used to be Chevron Supreme until they pulled out of the Mid-Atlantic. I now use Shell V-Power and the car runs perfectly. I still add a 20oz bottle of Chevron Techron every 3000 miles as a precaution.

W210Wagon

I have only used premium. I don't know if it is a fact but a friend (05 E320) told me she uses mid grade often but that she gets slightly better mileage with premium.

Dnasty

Damn I need to get a sams club card they don't even offer 93 anywhere local.

easyrider13

I use the GasBuddy.com on my iphone to find the lowest cost for top tier (http://www.toptiergas.com) premium gasoline.