Average mileage for a stock 3.2 S?

[Michiganstar]

Originally Posted by shadrach74

Greetings folks,

I've seen a few of 986 S owners on this board claim avg mileage in the mid to high 20s. I've run about tanks through my car and have never done better than 19.5mpg. O2s have been replaced as has the air filter. What do you typically average?

Wow thats low! Is this purely town driving and no longer runs? I easily see 27-29mpg on average. On a recent trip at a fairly constant 90-95mph it still returned 28.8 over the whole 140 mile journey. Mine is a bone stock 260 lump run on 98 Octane Super Unleaded.

[Idaho Red Rocket 3]

My 2K S with the 3.2 L gets about 20 mpg around town and about 26-28 mpg on a road trip. My 98 base with the 2.5 L got 24-26 around town and 31-33 on road trips.

[shadrach74]

So, from what I can see so far, everyone does better than me, some by a little, most by a significant amount. I have a durametric, but have not bought a PC to load the software on yet. I will be checking the LTFT and STFT as soon as possible. I suppose it could be a leaky injector as well...

The car runs fine, just not as strong as it should for HP/lbs. I've sorted through a number of little issues hoping that I'd get a significant change. that has yet to happen...

[Sanford_yee]

Let us know how it goes with the durametric. I'm in the same boat as you, only about 21-22 avg. Just did a full 90k tuneup and no improvement in mileage.

[shadrach74]

Originally Posted by Sanford_yee

Let us know how it goes with the durametric. I'm in the same boat as you, only about 21-22 avg. Just did a full 90k tuneup and no improvement in mileage.

I'd love to see 21-22mpg...

[hossuk]

I use an app called acar for my Samsung Galaxy S3 and fill the details of my fill up's every time. On the 1st graph below the flat line is due to the fact that in Malta they have a system where when the gas station is unmanned you can pre-pay for your gas by cash in a machine which is what I do. Therefore it is not so easy to fill up completely. Thus during this time the mpg was only calculated at the first complete fill when I left to return to the UK. The two peaks are when I drove long distance from the UK to Malta & on the journey back, the rest is all city driving.

Note this is in Imperial Gallons which I believe equates to 1.201 US gallons.

Average during this time was 20.722 / Best 29.439 / worst 17.878



Here is the last 3 months only :-





PS. This is the chart showing the mileage using info sourced from Service Manual receipts etc, I only got her at end of March this year.