What Mpg Are You Really Getting?

[frovin]

Thanks for the comments on my driving.

I have an MMT gearbox, but generally do manual anyway. The auto shifting is claimed to do the same mpg as the manual. It shifts something like this:

At low speed acceleration it always shifts at 2100 rmp no matter what, when increasing the acceleration it starts to climb up in the numbers (3k-4k)

I read a rather comprehensive 60 page report on eco driving, it's in Danish, so i wont link. This report claims that very slow acc will use 40 % more fuel than a relative quick one. The recomendation is to use between half and two third throttle to reach cruising speed, and then start overdriving at constant speed.

Some own stats where I used a full tank on the same kind of driving:

I did a 700 miles run on the german autobahn (5-10C temp outside). When REALLY liturally pushing it to maximum all the way it did 37 mpg (i liturally measured 113 mph on the GPS!!).

When doing short congested urban commutes (4 miles) during Danish winther (+-0C) it does just 37,5

Today I did a full tank highway driving 70 mph (20C), and it managed to get to 50 mpg (with AC on half the time).

In conclusion, i think the main factors affecting fuel efficiancy is: Lenght of commute, driving style and outside tempture.

Jakob

[zerosome]

I read a rather comprehensive 60 page report on eco driving, it's in Danish, so i wont link. This report claims that very slow acc will use 40 % more fuel than a relative quick one. The recomendation is to use between half and two third throttle to reach cruising speed, and then start overdriving at constant speed.

I've seen at least two studies that would directly contradict this claim. The only explanation I could imagine for such a result would be if they maintained high RPM (but very low throttle) through their slow acceleration runs. At a higher RPM engine efficiency drops, which when combined with longer periods of acceleration might explain the lower overall efficiency. I really should do the maths on rapid versus slow acceleration.

[Laura G]

I squeezed in £32 but that is probably a reflection on UK petrol prices rather than the size of the tank...

After a journey of 150 miles there were 5/6 bars left, now after 185 miles 4/6 bars left. But I'm suspicious of 'disappearing bars' too, will see whether there are still 4/6 bars left in the morning! ;)

No disappearing bars when I came to the car this morning, but on my journey it went from 2/6 bars to fast-flashing bars very quickly! Having said that though I was doing a fair bit of heavy accelerating up steep Somerset hills :P

I must have made about 335 miles from the tank, roughly, which makes about 44mpg. I reckon I could do better than this normally as my journey this morning was made with a load of luggage and crates of stuff (I'm in the middle of moving between flats), and the hills are tough on the diddy engine!

[jdavtz]

Just for interest of anyone else interested in the mpg of the Aygo, here's my data for the last 20000 miles.

Tank always filled until petrol pump clicks off. Driving mostly dual-carriageway, usually fairly relaxed (60ish mph) but over the 20000 miles there's a fair bit of urban use mixed in plus some 80-90mph use on motorways from time to time (though I tend to drive at 60-70 on motorway normally - the engine feels more comfortable at that speed).

Anyway - just for interest: (hoping image linking works...)

[Cokeman]

Just filled up for the 9th time since we bought it, still only done 2866 miles from new, so not raced or rallied as they say. The Economy is definately getting better, have worked it out that I put in 36.00 litres, travelled 393.6 miles, giving me a return of around 49.7mpg. This is the best figure to date, and it doesn't do that many Motorway miles. I am on Hols in a couple of weeks, and it will get a bit more use then, with a few trips planned to Somerset & Dorset, which will give it a better run. Still looking for that magical 60+ mpg that everyone is on about. I'll keep you posted.

[feldman]

I must have made about 335 miles from the tank...

My personal "best" is an indicated 377 miles from full to me chickening out and putting fuel in. I'd got a good 30-ish miles from the indicator starting to flash and when I filled up again the pump said it was 35 litres! Seeing as it's a 33 litre tank plus the filler pipe, that's daring for me!

What kills my fuel economy is short trips to the shops etc. In summer it's not so bad because the engine reaches good temperature quicker, but in winter it's a killer. I try, whenever I can, to get all my trips/jobs/errands done in one go and that makes a difference to my mileage.

I'd be interested to find some definitive info on gear ratios. With Urban driving I go through all the gears, no block shifting, up to 5th at an indicated 32/33. If I need to accelerate I always drop one or two gears even if it's just up to 40mph. I didn't get the rev counter with Hugo, but the engine sounds nice and quiet with no rumbling or growling at 30 in 5th however I may be wrong.

As soon as there's traffic or I start to drop below 30mph then I change to 4th etc. Also, when braking for lights I try to:

1) Avoid coming to a full halt- I brake right down and roll forward in 2nd trying to time it right. Apparently a huge chunk of fuel goes on getting the car moving from a standstill. Even the slightest roll forward can help.

2) As said above, don't "Freewheel" with the clutch down. I can brake, in 5th gear, right down to about 5mph before the engine gets grumpy and your momentum keeps the engine ticking over. It's yards for free!!! ;)

[daveyjp]

"I'd be interested to find some definitive info on gear ratios. With Urban driving I go through all the gears, no block shifting, up to 5th at an indicated 32/33. If I need to accelerate I always drop one or two gears even if it's just up to 40mph. I didn't get the rev counter with Hugo, but the engine sounds nice and quiet with no rumbling or growling at 30 in 5th however I may be wrong. "

This is bad for the engine and economy - despite the engine seemingly being able to do 30 in 5th you are actually labouring the engine and this uses more fuel - to test if you are labouring plant your foot flat to the floor. If the car doesn't accelerate immediately it is being laboured.

Whilst driving is an art and all circumstances need to be taken into account advice now is no higher gear than 3rd for a 30 zone. You have better control over the car as it will accelerate immediately should it be needed. You use the clutch less as fewer gear changes are needed and it is easier to keep the car at 30 when going downhill, hence less chance of creeping over the speed and getting a ticket.

For further info see the link below which which does a good analogy with a pushbike:

http://www.ridedrive.co.uk/tipoffs06.htm

[feldman]

SNIP

Thanks for the tips and the link- some interesting reading. I'm currently coming up to needing to put petrol in so I might put a full tank in, reset the trip counter and try that- see if I see an improvement. I was always taught to drive in as high a gear as possible, but it seems I've been taking that too far.

How fast would you go up to in 3rd then? 35? 40?

[daveyjp]

How fast in third depends what speed I was accelerating to. To a 40 probably no more than 35, to a 50 similar to motorway I may go up to 60 and block change to 5th.

[Jan van de Wouw]

Seeing as it's a 33 litre tank plus the filler pipe

According to my manual it's 35 PLUS the filler neck...

[sphinktar1988]

lol 40+ mpg would be amazing

i used to get 30ish with a nackered exhaust

decated, full powerflow system n blitz filters helped me up to 37 but aint goin no higher than that

[adilmon]

My turbo diesel Aygo gets 60-66mpg with fairly brisk driving.

I only recently learnt that the Aygo has a relatively high turbo boost pressure, which means an intercooler should have a significant effect. I just need to clear it with the insurance company before I fit it.

[Lisa26]

I seem to get between 57 - 60 MPG in my MMT Aygo+.... which is so much better than the 35 MPG that I got in my Toyota Sera. As much as I love and miss my Sera I'm lovin the money I save driving my Aygo!

[Cokeman]

10th fill, 35 litres, (7.7 galls) 396 miles, I make that approx 51.4 mpg. Again, best to date, and definately getting better with age and usage. Longer runs helping, not so many "school runs" now they are on holidays.

[Cokeman]

Next fill, 366.7 miles, not down to bleep, squeezed in 31 litres. (6.82 galls), works out @ 53.77 mpg.

From Fareham in Hampshire, to Street in Somerset, along A303 with all it's hills, and into a fairly strong headwind. Good run back same route,but we got stuck in a jam on the M27 due to a burnt out Merc. So it has had a good workout, and an enjoyable jaunt for us. It was buffeted a bit by the wind, but we weren't the only ones.

Getting closer to that 60mpg, well pleased :)

[ben_e71]

First tank 372 miles..... got in 34 litres 49.8 mpg

[PaulT]

60.6mpg on the last (petrol) tank. Yay

There was a longish motorway journey in that (320 miles) and some stop start commuting stuff, so not bad really.

Paul.

[feldman]

Just got 416 miles out of the last tank- easily my best yet and all from driving in 3rd at 30mph and 4th at 40mph. Makes for a much smoother drive, a lot less gear changes in there. :D

That was the most daring I've ever been with the reserve though- won't be that risky again

[BadBoyVTEC]

I always drive 1st upto 35 then 2nd upto 60ish and then 3rd upto 80ish don't use 5th unless im on the motorway and 4th goes upto top speed anyway with more response than 5th. And generally speaking i usually get between 38 and 40 mpg

[ben_e71]

I always drive 1st upto 35 then 2nd upto 60ish and then 3rd upto 80ish don't use 5th unless im on the motorway and 4th goes upto top speed anyway with more response than 5th. And generally speaking i usually get between 38 and 40 mpg

thta's why you are getting pants MPG

[adilmon]

I own a diesel aygo & it took me 2hrs to get home on Sunday, because I was driving like a milk float (60mph). The journey was from bournemouth to gatwick, which is about 95 miles. I calibrated the scangauge II and averaged 90.4 mpg!!!!! I was very very plesantly surprised. I've read on the net that the Aygo did this before, but I didn't believe it because I was suspicious that the car was somehow modified, in order to get the 90mpg for the good publicity.

http://www.automotoportal.com/article/Toyo..._at_Silverstone

The outward journey averaged 68.3 mpg (probably going faster than I should have been on the M27). It's not easy driving economically and takes just as much attention as driving normally. I also discovered that more fuel is used if you are coasting in neutral, rather than leaving it in gear.

Three cheers for diesel ! :D

[Jan van de Wouw]

I also discovered that more fuel is used if you are coasting in neutral, rather than leaving it in gear.

That's very logical: when you leave it in gear the momentum of the car keeps

the engine turning, so no fuel is injected since it's keeping its revvs.

When you stick it in neutral the a sensor detects the engine

falling below stall-rpm and injects fuel to keep it going...

[Red Yaris 54]

I managed a massive 73.0 MPG Average with my petrol Yaris Ion yesterday..................(same engine as the Aygo, just a bit more body weight - the car & me )

when pushed quite hard the average drops to 54.0 MPG.............still quite economical.

Just one year old and 14,000 miles on the clock.

[BadBoyVTEC]

I managed a massive 73.0 MPG Average with my petrol Yaris Ion yesterday..................(same engine as the Aygo, just a bit more body weight - the car & me )

when pushed quite hard the average drops to 54.0 MPG.............still quite economical.

Just one year old and 14,000 miles on the clock.

Very bless.

[weevicky]

Try BP Ultimate fuel it gives you more miles in a tank in improving performance whilst cleaning your engine at the same time <-- Promoting my work here, aye, but its all true :)