90mpg Aygo

[adilmon]

The only problem with any normal diesel is that they sound boring. I'd rather have 60mpg and stay awake whilst travelling :P

Regards

Andy

That's why I brought this :)

BTW- An independant study to get to the bottom of which petrol was best for real world driving. Turns out Tesco99 won

http://www.pistonheads.co.uk/news/default.asp?storyId=14919

[WOWtcg]

...For TOWN DRIVING, coasting in neutral works out to be more efficient because of the gearing and the low momentum makes engine braking more apparent.

Don't know what's the reason, but in my case coasting in neutral shows less consumption.

I'm driving with a lotta coasting (in neutral). Have readed here, that coasting in gear is more efficient, and tried that. My consumption (when coasting in neutral) was 5,2l per 100km. And when coasting in gear - about 6,5l per 100km.

Maybe upper argument (quote) was true. Maybe the reason is the length of the coasting. I noticed that the length when coasting in gear is shorter, because of the engine breaking. The length of the coasting in neutral is longer because there's no engine breaking, and the acceleration that you get (which is not hindered by engine breaking) lets you to start coasting

earlier. Not putting the knob in gear, gives you longer coasting till stop (usually at the red lights). That way you'll get your foot off the gas earlier.

I'm talking about hard, dense urban (town) driving.

[Red Yaris 54]

...For TOWN DRIVING, coasting in neutral works out to be more efficient because of the gearing and the low momentum makes engine braking more apparent.

Don't know what's the reason, but in my case coasting in neutral shows less consumption.

I'm driving with a lotta coasting (in neutral). Have readed here, that coasting in gear is more efficient, and tried that. My consumption (when coasting in neutral) was 5,2l per 100km. And when coasting in gear - about 6,5l per 100km.

Maybe upper argument (quote) was true. Maybe the reason is the length of the coasting. I noticed that the length when coasting in gear is shorter, because of the engine breaking. The length of the coasting in neutral is longer because there's no engine breaking, and the acceleration that you get (which is not hindered by engine breaking) lets you to start coasting

earlier. Not putting the knob in gear, gives you longer coasting till stop (usually at the red lights). That way you'll get your foot off the gas earlier.

I'm talking about hard, dense urban (town) driving.

In the UK coasting is normally seen as being dangerous as (In theory)the driver is not in full control of the vehicle.

[PaulT]

In the UK coasting is normally seen as being dangerous as (In theory)the driver is not in full control of the vehicle.

That attitude does date back a looong time, though :D

I think these days when we have working brakes you might as well save on wear and tear as well as fuel consumption.

Paul.

[Phoenix999]

The only problem with any normal diesel is that they sound boring. I'd rather have 60mpg and stay awake whilst travelling :P

Regards

Andy

Strange concept for driving I tend to drive with my eyes rather than my ears ;)

[Jan van de Wouw]

My consumption (when coasting in neutral) was 5,2l per 100km. And when coasting in gear - about 6,5l per 100km.

I take it these figures are worked out after fueling up? So no actual consumption at the moment of coasting in or out of gear?

On every car I've driven that had a display for the current fuel consumption (which I'll have on my Aygo too, as soon as my

ScanGauge II arrives) the display shows a fuel consupmtion of 0 (ZERO) when coasting in gear, while coasting with the clutch

depressed or the gear in neutral shows consumption, as there is no momentum from the car keeping the engine from stalling...

[adilmon]

To coast effectively, I put it in the highest gear possible in order to keep the revs low and minmise the engine braking effect. This is easier with diesel engines because they tend to operate between 2-3000 rpm, compared with the 3-6000 rpm of the petrol Aygo. For Example, if I'm driving at 2200rpm in 4th gear, I will change to 5th gear (rpm drops to 1500rpm) for coasting. When I reach the regular idle rpm of 1000rpm I change up to 4th to avoid lugging the engine and to keep the engine load at zero.

Since petrol generates more heat losses, operates at higher revs (hence greater engine braking) and has relatively low torque, it is much easier to coast in neutral in town driving. Getting the right gear takes a lot of concentration.

[adilmon]

Just an update. I went on a long motorway run (490 miles) at about 75mph (according to GPS) give or take 10mph occasionally (overtaking or traffic ). I averaged 63mpg. It's a big hit to the extra urban mpg and wasted about 6 litres of fuel, but it saved over 90 minutes of driving.

[Smoothound]

Just an update. I went on a long motorway run (490 miles) at about 75mph (according to GPS) give or take 10mph occasionally (overtaking or traffic ). I averaged 63mpg. It's a big hit to the extra urban mpg and wasted about 6 litres of fuel, but it saved over 90 minutes of driving.

This is the thing. It's time vs economy. What price do you put on your own time?

For my hour commute, I can happily stick to 60MPH. But for holiday this year, we're going to Cornwall (about 5 hours drive). So it will be at 70ish all the way!

[adilmon]

This is the thing. It's time vs economy. What price do you put on your own time?

In my case, I was trying to get past Heathrow airport before the rush-hour began, so I had more to loose.