ccaarmerciill

I got about 25 mpg from San Francisco to Connecticut in my 84, but I am also running the larger twists. It seemed to get better gas mileage around 75-80mph because when it was closer to 60 mph it felt like it was too low in the RPM's, kind of bogging it up hills etc... anyone else feel the same? but maybe I'm wrong, maybe thats why I got a few less mpg's than everyone else.

Relaxed90

^ Me too.

When I drive to the parent's house 3hours away, I've tried going 65-70mph and going 75-80mph. 75-80mph obviously gets me there quicker, but surprisingly with the same gas mileage.

robert944h

Has anybody recorded the mpg before and after a cat bypass or testpipe install?

Rock

My cat bypassed Yellow 84 got 27mpg average from VA to MN. This was with a fuel leak in the rear too.

ecostellodo

My tank sticker says to use 91 octane on my 83 NA.

hacker-pschorr

You can always do what the open road racers do. Tape up all the seams on the car, grind off the rain gutters (if there are any) remove the windshield wipers, maybe even the rear spoiler. Take off the rearview mirrors (tape up the holes). tape over the fog lights or any other openeing you may not need.

You get the idea

John_AZ

This is explained in Wikipedia:

In most countries (including all of Europe and Australia) the "headline" octane that would be shown on the pump is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, this means that the octane in the United States will be about 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, would be 91-92 in Europe. However most European pumps deliver 95 (RON) as "regular", equivalent to 90-91 US (R+M)/2, and even deliver 98 (RON) or 100 (RON).

John_AZ

jtsporsche

didnt the european cars have higher compression? mabey they only made one sticker and put it there, regardless of the market.

88BlueTSiQuest

John_AZ's answer above should clarify this.

The spec for our cars is in RON, our 87 octane is about the equivalent of 91-92 RON.

Voith

haha ****.. you gotta be kidding right?





this is in euros per liter.

1euro = $1.55

1 Liter = 0.26 gal

in nederlands 1liter costs approx. 1.6 euro or $2.48

so 0.26 of gallon is $2.48...

ecostellodo

$6.00/gal in the US and people would freak.

John_AZ, thanks for the clarification, but then do S2 and 951 have a higher gas tank sticker RON? According to the explanation the RON sticker would be about 95.

John_AZ

This is becoming a popular topic. $4 for regular...
Here is a recent post that covers it again. Skip to post 42 for a good answer.
https://rennlist.com/forums/showthre...ght=951+octane
John_AZ
1988 924S 58K-regular
1987 924S 115K-regular

bluedevil

No doubt, but man it is good, this helps. Keep it coming and I may PM about the hydrogen solutions.

zoltan944

I have the same sticker on my Turbo. So I can run regular with no problem?

88BlueTSiQuest

I never noticed that, but both my '83 and '86 951 have very similar stickers with the same 91 RON 'requirement'.

Honestly, if you have an unmodified 951, yes you could run 87. But you'd be suffering from diminished performance when the knock sensor starts tattling.