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Gas Consumption
Saab Saab Automobiles Discussions (alt.autos.saab)
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#1
 
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Gas Consumption -
10-18-2006
, 07:50 PM
#2
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Something weird with my '06 9-3 Aero sport combi. Driving at 100 Km/h gives around 12 l/100 Driving at 120 Km/h gives 11 l/100 and 130-140 average gives 10 l/100. Those numbers comes from 2 runs : one of around 1800 Km in 2 days and the 600 Km today. The fastest you go, the less gas you take. Crazy. At 140 Km Rpm is around 2300. That might explain things a bit. Any other explanation ? like my computer is crazy ? |
There may be too many variables such as the weather, the quality of the fuel
or the tyre pressures. It's also possible that at 100 km/h you're labouring
the engine in top gear and you may get better mileage figures in the next
gear down.
--
The DervMan
www.dervman.com
#3
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Something weird with my '06 9-3 Aero sport combi. Driving at 100 Km/h gives around 12 l/100 Driving at 120 Km/h gives 11 l/100 and 130-140 average gives 10 l/100. Those numbers comes from 2 runs : one of around 1800 Km in 2 days and the 600 Km today. The fastest you go, the less gas you take. Crazy. At 140 Km Rpm is around 2300. That might explain things a bit. Any other explanation ? like my computer is crazy ? |
In any case, Saab likes to drive around 130-150 not 100, this is a
performance car not a VW Beetle ;>
I notice on the old 900 it does like 100 km/h for economy, but I go
130-150 anyway. The V6 with the tall gearing like you have probably is
working more efficiently at such speed.
#4
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Junkyard Engineer wrote: Something weird with my '06 9-3 Aero sport combi. Driving at 100 Km/h gives around 12 l/100 Driving at 120 Km/h gives 11 l/100 and 130-140 average gives 10 l/100. Those numbers comes from 2 runs : one of around 1800 Km in 2 days and the 600 Km today. The fastest you go, the less gas you take. Crazy. At 140 Km Rpm is around 2300. That might explain things a bit. Any other explanation ? like my computer is crazy ? That is calculated milage from fillups or is it from the SID? In any case, Saab likes to drive around 130-150 not 100, this is a performance car not a VW Beetle ; I notice on the old 900 it does like 100 km/h for economy, but I go 130-150 anyway. The V6 with the tall gearing like you have probably is working more efficiently at such speed. |
But efficiency is not the same as fuel consumption. The vast majority of
petrol engines are very inefficient at part throttle conditions, where part
load here could be at 100 km/h or at 130 km/h. The less the throttle the
less the efficiency, but they're still more economical at 100 km/h compared
to 130 km/h.
--
The DervMan
www.dervman.com
#5
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| "SmaartAasSaabr" <smaartaassaabr (AT) gmail (DOT) com> wrote in message news:1161391771.986000.244870 (AT) k70g2000cwa (DOT) googlegroups.com... Junkyard Engineer wrote: Something weird with my '06 9-3 Aero sport combi. Driving at 100 Km/h gives around 12 l/100 Driving at 120 Km/h gives 11 l/100 and 130-140 average gives 10 l/100. Those numbers comes from 2 runs : one of around 1800 Km in 2 days and the 600 Km today. The fastest you go, the less gas you take. Crazy. At 140 Km Rpm is around 2300. That might explain things a bit. Any other explanation ? like my computer is crazy ? That is calculated milage from fillups or is it from the SID? In any case, Saab likes to drive around 130-150 not 100, this is a performance car not a VW Beetle ; I notice on the old 900 it does like 100 km/h for economy, but I go 130-150 anyway. The V6 with the tall gearing like you have probably is working more efficiently at such speed. |
For those who wish to convert between the European l/100km and the US MPG, you
can simply multiply by .00425, then take the inversion. Since it's an
inversion, the same operation works in both directions. So the 12, 11 and 10
l/100 mentioned above, become 19.6, 21.4 and 23.5 MPG respectively.
As a simple mental calculation, remember that the two scales are approximately
equal at 15. 15l/100=15MPG. Away from this number, they go in opposite
directions, so 7.5l/100= about 30MPG (31.4 really) and 7.5MPG also equals
31.4l/100.
GF
#6
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Junkyard Engineer wrote: Something weird with my '06 9-3 Aero sport combi. Driving at 100 Km/h gives around 12 l/100 Driving at 120 Km/h gives 11 l/100 and 130-140 average gives 10 l/100. Those numbers comes from 2 runs : one of around 1800 Km in 2 days and the 600 Km today. The fastest you go, the less gas you take. Crazy. At 140 Km Rpm is around 2300. That might explain things a bit. Any other explanation ? like my computer is crazy ? That is calculated milage from fillups or is it from the SID? In any case, Saab likes to drive around 130-150 not 100, this is a performance car not a VW Beetle ; I notice on the old 900 it does like 100 km/h for economy, but I go 130-150 anyway. The V6 with the tall gearing like you have probably is working more efficiently at such speed. |
70-75 than I do at 50-55. I suspect that good aerodynamics, and tall gearing
are the reason. The throttle is open wider, the turbo is able to recover more
energy from the exhaust etc.. Every car has a particular "sweet spot" where
you get maximum economy vs. speed, modern Saabs seem to have it a little
higher than most.
Kevin Rhodes
'00 9-5 SE v6t Wagon (20-29mpg)
'92 C900CVT (25-33mpg)
#7
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In article <1161391771.986000.244870 (AT) k70g2000cwa (DOT) googlegroups.com>, "SmaartAasSaabr" <smaartaassaabr (AT) gmail (DOT) com> wrote: Junkyard Engineer wrote: Something weird with my '06 9-3 Aero sport combi. Driving at 100 Km/h gives around 12 l/100 Driving at 120 Km/h gives 11 l/100 and 130-140 average gives 10 l/100. Those numbers comes from 2 runs : one of around 1800 Km in 2 days and the 600 Km today. The fastest you go, the less gas you take. Crazy. At 140 Km Rpm is around 2300. That might explain things a bit. Any other explanation ? like my computer is crazy ? That is calculated milage from fillups or is it from the SID? In any case, Saab likes to drive around 130-150 not 100, this is a performance car not a VW Beetle ; I notice on the old 900 it does like 100 km/h for economy, but I go 130-150 anyway. The V6 with the tall gearing like you have probably is working more efficiently at such speed. I have found the same with my '00 9-5 V6t Wagon - I get better fuel economy at 70-75 than I do at 50-55. I suspect that good aerodynamics, and tall gearing are the reason. The throttle is open wider, the turbo is able to recover more energy from the exhaust etc.. Every car has a particular "sweet spot" where you get maximum economy vs. speed, modern Saabs seem to have it a little higher than most. Kevin Rhodes '00 9-5 SE v6t Wagon (20-29mpg) '92 C900CVT (25-33mpg) |
#8
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I have found the same with my '00 9-5 V6t Wagon - I get better fuel economy at 70-75 than I do at 50-55. I suspect that good aerodynamics, and tall gearing are the reason. The throttle is open wider, the turbo is able to recover more energy from the exhaust etc.. Every car has a particular "sweet spot" where you get maximum economy vs. speed, modern Saabs seem to have it a little higher than most. |
My own experience does not replicate these assertions.
Of the five Saabs I've owned, none has averaged 30MPG overall.
Using the on-board computer of my current 900TurboSE 2.0L (have no test
information to confirm its accuracy) the economy is very good (36MPG+) in high
gear at 55MPH. Above this it goes lower (28MPG at 75MPH).
GF
#9
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For those who wish to convert between the European l/100km and the US MPG, you can simply multiply by .00425, then take the inversion. Since it's an inversion, the same operation works in both directions. So the 12, 11 and 10 l/100 mentioned above, become 19.6, 21.4 and 23.5 MPG respectively. |
10 l per 100 km in mpg
....and out spits "23.5214584 miles per gallon."
Google is a wonderful thing. :-)
#10
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| Greg Farris <farris (AT) nasa (DOT) org> wrote: For those who wish to convert between the European l/100km and the US MPG, you can simply multiply by .00425, then take the inversion. Since it's an inversion, the same operation works in both directions. So the 12, 11 and 10 l/100 mentioned above, become 19.6, 21.4 and 23.5 MPG respectively. Or if you're lazy, you can do like do: go into Google and enter 10 l per 100 km in mpg ...and out spits "23.5214584 miles per gallon." |
I cannot, but I have programmed it into my HP calculator, which is
virtually always with me, and doesn't require an on-line connection. And
even without that, using the "15" rule, I can do it roughly in my head.
I agree, Internet is a fantastic resource.
Knowledge is even better!
GF
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