Hey, whatever works. Some people can get away with less octane, while others need more. A lot of it is based on driving habits, engine condition, and atmospheric conditions.

That's interesting, I wonder if I got some bad info on the S5 octane requirements? What octane rating does your US 1991 manual recommend?

 

Mine doesn't have a manual, unfortunately. But I'm thinking I may switch to mid in the coming months anyway. It gets bloody hot n humid here during the summer, and the extra margin may be needed.

 

Well for those of you all that get bad mileage: O2 sensor, plugs, plug wires, fuel filter, fuel injector cleaner and some other things you should look at.


Santiago

 

I get 320 miles per tank when most of my driving is highway (then again im speeding so maybe im not getting the best millage ) (turns out to be 20 mpg)

 

i get about 18mpg in my s5 n/a

 

man it sometimes feel like i get 11 mpg!!!
i think i should calm down with the speeding
even not speeding i think im getting a low 14 mpg
an i only have a streetport with mild mods
i think i might just have to check something out because something has to be wrong

 

My 1991 manual has a recommendation of 87 octane or higher. So I guess you got some bad info.

 

Thanks Jerry, apparently I need to do a better job of filtering my source data from the internet.

Sorry for the misinformation.

 

I get anywhere from 8 to 20mpg depending on how I'm driving it and what the driving conditions are. ^_^ Average is around 15 or so in Seattle traffic .

-ZenFox

 

I'll let you know what kind of gas mileage I get sometime after I manage to get my RX out of my friend's yard... shouldn't take me more than a few days, seeign as I usually go through 2/3 of a tank in about 2-3 days