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[FireFlower]

Thanks to your Colt's speaker of choice, we get same speakers in our Forfours . Well basically same car just different exterior panels and interior cushions.

Anyway I have hit the bottom of MPG today. 39.5 litres and 550km distance just with normal commute traffic trough highway (100km daily driving)
39.33 MPG
7.18l / 100km

Why this happened? Winter stud tires have must higher roll resistance in warm weather and dry asphalt so as you can see 2l increase in fuel consumption per 100 km with same driving style.

Or my gas tank is leaking

[steddie eddie]

G'day there,
Hi cheesney,  I've got a Smart forfour 1.5l petrol and get about 55 mpg so I cant see why you get such a poor mpg in your smaller engine car   I am a careful driver and do most of the things mentioned  above , so it is possible to get much better fuel use imho.
Greetings,
eddie.

[CrazyG]

The 1.5 petrol has a bit more 'low down grunt' a.k.a. torque than
the 1.3 petrol, although they are more or less similar in hp terms,
so if your route or driving uses that 'grunt' then that could be where
yours would be getting better economy than a 1.3.

Personally, I'd ignore nearly every figure displayed on the dash
in the way of mpg.  Instead my choice would be buy/use an OBDII
Bluetooth adapter and the Torque app on a mobile phone...OR...
why not wait till the fuel gauge flashes at 5L, then fill it up,
keep the fuel receipt safe, zero the tripmeter on the dash speedo display
and then see what mileage it says when the 5L flashes once again.

Then take the amount of fuel you got (off the fuel receipt), and
divide the mileage by that figure...et voila...a rough figure of your mpg.

[Brabs]

Yep, if/when I can be bothered to work out MPG I always do a 'mathematical' calculation. Covert litres to gallons used and then divide the mileage covered by the gallons. Easy and more reliable than hopelessly wild computer figures! IMHO!

 

[steddie eddie]

G'day there,
That's exactly what I have done Brabs.
I have filled up 8 times now and have done my sums and my average on that is 19.5 kml or about 55mpg, so that's not bad going for a 1,5l forfour petrol from 2004 with 82000km on the clock.
Greetings,
eddie.

[FireFlower]

Yep, if/when I can be bothered to work out MPG I always do a 'mathematical' calculation. Covert litres to gallons used and then divide the mileage covered by the gallons. Easy and more reliable than hopelessly wild computer figures! IMHO!

 

Of course computer figures are wild if you have not calibrated torque fuel data divider I have calibrated mine to be 1.104 (default is 1) with calculated values.

[fluked]

I used this site.......
http://www.fuel-economy.co.uk/calc.html

I used to fill to brim and eek out till empty, on every fill. I'd get about 35mpg, and occasionally 42 on motorway runs. 350-400 miles on a tank. lil smartie said she used to get roughly 35mpg town driving also.

[FireFlower]

I get 750km with 42 liters of fuel.

I used this website: http://www.markporthouse.net/rangie/fuelconsumptionconversion.htm

350-400 miles with full tank. The reason why you don't get higher figures because you're not used to minimum throttle needed to maintain current speed and best gear option. You need to set up torgue to show instant MPG or l/100km to find the best throttle position. If I hadn't done that I would get 6.5-7.0l/100km like you but a very small difference causes average fuel consumption to go down by 1 unit.

Here is my torque app dash:
Long term average consumption (I reset it every time I refuel) and trip average consumption. With instant value I control throttle (with speedometer)