FUEL Consumption

[Guest]

Hi Guys, what should the avarage MPG on an old 911SC be, engine in fairly good nick.

 

[bones]

They became more economical with age, so start from a base of 20mpg - around town, 15mpg - very spirited driving and 25mpg - motorway cruise.

 

[dugsud]

I got 27mpg average on a two week 2500 mile tour of europe in the summer!

That was a real mix of roads from 90mph for hour upon hour autoroute blasts to climbing through alpine passes & even a few flat out laps of the Nurburgring []

I think the 911 SC is one of the most echonomical cars of it's type around. Just try running a modern TVR, Aston or even a scooby & I think you'll find for a 20+ year old car SC are not bad!!

 

[Guest]

Hi Tom, I give mine a bit of stick most of the time and it's never less than 18, average is about 24/25 on mix of roads but have had 27/28 out of it sticking to the 130km/h french limit. Agree with Doug - they are great on fuel compared to what else is out there at a similar age/price/performance.

 

[cramond]

Think I get roughly high 20's 27-29 on long runs but low 20s when I use the right foot. Car is a bit modified though as it has a 3.4 RUF conversion = 295bhp so this may gobble a bit more juice!

 

[ejgs]

Thanks for that I seem to be getting approx 21 mpg.

Thinking of putting the car on a rolling road to see what it comes up with.

 

[sonflowerinwales]

Evening
I have a '79 SC, 3.0L. Regular use sees around 24 mpg, heavy right foot around 21 mpg.
Hope this helps
Paul

 

[dij999]

My SC does 26 average, 20-22 when pushed. Not much different to my 996.

 

[chris.hevey]

ORIGINAL: ejgs

Thanks for that I seem to be getting approx 21 mpg.

Thinking of putting the car on a rolling road to see what it comes up with.

It might be worth having the engine tested for compression loss too. Do you know if it still has the original air pump? (The one that's there just to pump fresh air into the exhaust?

 

[PORKA]

Mine did around 21-22MPG heavy footed or 28MPG on a good run on M roads or abroad.
When the engine was overhauled generally average 25MPG. []

 

[Elliot]

To be honest i dont even watch the needle.

 

[ejgs]

Probably still got the original air pump.

Only noticed the difference as this a new car to, on my old one (same year etc) I used to get aroud 29 mpg for the same journeys.

Will get the compression tested.

Thank for the feed back.

 

[bones]

ORIGINAL: cramond

Think I get roughly high 20's 27-29 on long runs but low 20s when I use the right foot. Car is a bit modified though as it has a 3.4 RUF conversion = 295bhp so this may gobble a bit more juice!

295bhp from a TUNED SC? This exceeds all factory figures I have seen for ex works racers using Kugelfisher injection. Admittedly you have 400 cc extra - but still- tell us more about that engine please as such an engine would be pretty intractable and would probably destroy the stock gearbox and driveshafts pretty quickly.

 

[chris.hevey]

Ironically for a device that was supposed to help the car pass emmision standards, all the air pump does is pump air into the exhaust as it leaves the engine thereby robbing it of about 5hp in the process and thereby burning more fuel! Most folks seem to recommend getting it out pronto!

 

[sonflowerinwales]

Just done me sums after last weeks trip.
Commute (blast) to work, track day at Brands, fast cruise home, 800 miles all at 22.3 mpg. It's ok for me.
Paul