Is this a good fuel consumption

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#1284497 15-Apr-2015 10:00

joker97:
DravidDavid:
frankv:

anticipate stop signs / lights - don't wait until the last minute to stop

I've heard this before, but I don't understand the mechanism by which this would affect fuel economy. Unless you're suggesting coasting up to the stop sign/lights from some distance away?

In a modern car, fuel is not being dumped in to an engine when your foot is not on the throttle. If you anticipate a stop sign and use the engine to brake, rather than speed up to the stop sign and brake, you save on fuel.

Also, speeding up long before a hill and using energy you've built on the flat road will also save you on fuel. Your car will not have to rev as hard to get up.

I like the idea of this one ... but will the cops be happy?

Cops only camp the down-hill part. You're engine braking by then ;)

davidcole

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#1284510 15-Apr-2015 10:17

I've got averaged 9.8l/100 90% city driving on a 3L TDi

I track it all in Fuelly, which is fairly good for comparing other users figures

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Wade

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#1284534 15-Apr-2015 10:26

Fuel consumption can depend as much on where you drive as how you drive, I have a V6 honda that uses as little as 9.3l/100 on open road driving (not economy driving just normal open road driving) and up to 14l/100kms in stop start traffic

The joys of driving 80% of the time in Auckland's peak hour traffic means bad fuel consumption regardless of how frugal one tries to be

I have always considered the golden rule of a normal car should get 5~600kms from a tank of gas most of the time, if you achieve that it is ok, little economical cars have smaller tanks and use less gas, bigger cars have bigger tanks and use more gas but push come to shove the amount of km's per tank is usually similar in round numbers

If you want the ultimate economy buy a Nissan leaf and work somewhere around Silvia park, AUckland as they have free park'n'charge stations for EV's at the Westfields :P

Edit: and in all the times i've gone there I have ever only seen one vehicle charging once so chances are good of securing a park!

heylinb4nz

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#1284539 15-Apr-2015 10:32

I log all of my cars past and present, heres some detailed info for you to compare, although all my cars past and present have been sports or modified. 1.5L NA is a small motor to pull a 1300kg+ wagon, so your economy sounds about right for a 1990's engine.

2004 Subaru Legacy (Spec B) ECU Remap (2.0L Turbo 230kw)

- 8.7L per 100km (open road best)
- 9.5L per 100 km (open road average)
- 13L per 100 km (town best)
- 14L per 100 km (town average)

2007 Mitsubishi Colt (1.5L Turbo 150Kw)

- 8L per 100km (open road best)
- 9.5L per 100 km (open road average)
- 12L per 100 km (town best)
- 13L per 100 km (town average)

1990 MR2 GT (2.0L Heavily modded 205 rwkw)

- 10L per 100km (open road best)
- 12L per 100 km (open road average)
- 14L per 100 km (town best)
- 16L per 100 km (town average)

1995 FTO GR (2.0L V6 stock)

- 8L per 100km (open road best)
- 9L per 100 km (open road average)
- 12L per 100 km (town best)
- 13L per 100 km (town average)

1999 Legacy B4 (2.0L Twin Turbo)

- 10L per 100km (open road best)
- 11L per 100 km (open road average)
- 14L per 100 km (town best)
- 16L per 100 km (town average)

Jase2985

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#1284578 15-Apr-2015 10:53

put it this way in our 2007 Honda Jazz i get .6L/100km less (6.2 vs 6.8) than my wife, the city/highway split is about the same for both of us. She is just heavier on the accelerator and on the brake than i am.

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#1284613 15-Apr-2015 11:39

Geek!

mattwnz

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#1284638 15-Apr-2015 12:20

The new mazdas have really efficient engines compared to other brands I have found. The 2 litre mazda 3 does just 5.7 litre/100k, while the 2.5 litre is just 6.1 litre/100 km. Compare that with some of these older cars with smaller weaker engines.

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#1284674 15-Apr-2015 12:43

In lab conditions or real life? Very different numbers you'll find

ajobbins

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#1284676 15-Apr-2015 12:46

My 3.6L V6 VE Commodore does around 8L/100k on a trip (seen it as low as 6.5), about 12-14 mixed, but sits as high as 19-20L/100km a lot of the time as it almost exclusively gets driven 200m down the road to the supermarket, and to and from work (Melbourne gridlock traffic). So lots of cold start/short trips or idling in traffic with frequent acceleration and stopping.

As you can see from this HUGE range, it really depends on the driving conditions.

Edit: 'Official' mixed consumption is 10.9L/100k, but that's lab conditions.

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Lias

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#1284744 15-Apr-2015 14:19

DravidDavid: My car isn't modern enough to have a computer calculating my fuel usage. But $60.00 gets about 350 kilometers in my 1992 MR2 Turbo. Mostly town, maybe one 150KM round trip.

Neither does mine, I just record my fuel purchases, odometer readings, and crunch it myself in a spreadsheet.. It's not rocket science.

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mattwnz

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#1284747 15-Apr-2015 14:24

joker97: In lab conditions or real life? Very different numbers you'll find

True, although some of the review I have seem they were getting that sort of efficiency. With automatics you would expect to get pretty close to it. Interesting that their manuals have higher fuel consumption, because in the old days I believe autos were less efficent.

mattwnz

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#1284751 15-Apr-2015 14:29

Apparently lightbox works on a mac, so connecting the mac to the TV using mirroring via HDMI may work?

Batman

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#1284752 15-Apr-2015 14:29

autos are still less efficient. but they are able to keep the revs as low as the engine will allow when you are not accelerating. AND the torque converter can disengage so the vehicle coasts when you are not accelerating whereas in the manual when you are not accelerating you are engine braking so to maintain normal speed you need to accelerate at 0 m/s2 and keep the gas on.

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#1284753 15-Apr-2015 14:30

mattwnz: Apparently lightbox works on a mac, so connecting the mac to the TV using mirroring via HDMI may work?

yeah great on gas too!

DravidDavid

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#1284783 15-Apr-2015 14:56

Lias:
DravidDavid: My car isn't modern enough to have a computer calculating my fuel usage. But $60.00 gets about 350 kilometers in my 1992 MR2 Turbo. Mostly town, maybe one 150KM round trip.

Neither does mine, I just record my fuel purchases, odometer readings, and crunch it myself in a spreadsheet.. It's not rocket science.

I'm not bothered about it enough to do any of that. It's interesting to measure once in a while to ensure I've got a good gauge of what "normal" is. But other than that, it's $60.00 in the tank every Friday no matter what.

The only thing I'd really like to measure is 100% motorway milage. Fill up at one station and go as far as I can on a single tank to see how well it does long distance. On a good week and I fill up from quarter, I hit the full mark at $60.00 and I can average about 490 kilometers to a tank. That's including spirited driving.

Every time I pledge to myself at the gas station that I'll drive nicely in the name of science, I break the rule by mistake the next day anyway, haha. :)

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