Official vs Real World Fuel Economy

1996 E36 328i Coupe
Claimed combined 30.7 with actual 24.5 over the last 5500miles
Only used for the 8miles each way A+B road commute 3 times a week and 4 trackdays.

2004 E46 320d Touring
Claimed combined 47.9 with actual 42 over the last 15000miles
 
I monitor mine like a nerd anyway-

Octavia vRS (mixed use)

Claimed - 35 mpg
Actual - 31.2 mpg

Fiat Grande Punto 1.4 16v (mainly town)

Claimed - 47 mpg
Actual - 34.3 mpg
 
My driving varies as I visit customers, but I tend to get 50-55MPG average per tank and the book figure for combined is 65.7MPG.

(Fiesta 1.4 TDCi)
 
Vauxhall vectra 1.9 Cdti 150

claimed 49mpg

actual on a 200k miles taxi with lots of idling short journeys and various hooning

IMG_0162.jpg



the last 1500 miles have been with a replaced inlet manifold due to swirl valve failure and economy has improved slightly to 43mpg
 
[TW]Fox;18637539 said:
Why tell us it has 200k miles when that figure was recorded when the screenshot clearly shows 150k? :p
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decimal point there :)

thats 15k :) (since the last reset on the trip computer

the 200k mention is to point out that its well used and what most would consider well past blowing up.
 
Manufacturer's figures are in my experience and opinion generally pretty reliable. If you do not achieve a figure, I suspect you will not achieve the figure for any car on your driving cycle. Likewise if you do, I suspect you will achieve the figure for any car.
 
Road Trip (or whatever the app is called, it's in that screenshot up a bit) tells me I've averaged 52mpg since I got my Ibiza 1.9 TDI 100 - combined book figure is 55. In fairness though, I've been out killing children on the dual carriageways because it feels good.

My dad tells me that diesel cars in the winter drop a good few MPGs, but I reckon that's just what he's telling me because his 2.2 DTi Auto Vectra's tells him he gets 39mpg and yet is slower than my car. :D
 
andrewdodd13 said:
My dad tells me that diesel cars in the winter drop a good few MPGs, but I reckon that's just what he's telling me because his 2.2 DTi Auto Vectra's tells him he gets 39mpg and yet is slower than my car. :D
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I believe most cars do, someone told me it was due to cold air being denser, the sensor sees more unburnt oxygen in the exhaust so adds more fuel to get rid of it, so you get more performance but less MPG

When it was really cold this year I went from an avg of 30mpg to 27mpg

Kimbie
 
Watching mine weekly anyway. 2000 miles since i've had it and its doing 46.7mpg, the combined is quoted at 55.4.
This on a Megane Coupe dci130
 
PMKeates said:
Manufacturer's figures are in my experience and opinion generally pretty reliable. If you do not achieve a figure, I suspect you will not achieve the figure for any car on your driving cycle. Likewise if you do, I suspect you will achieve the figure for any car.
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Nah, i don't beleive this, my Mondeo figures on the parkers site is quoted as 50MPG yet i can get 54-56MPG over a tank easily. However the Chevrolet Cruze 1.6 i had last year for 3 weeks as a courtesy car is quoted at 41MPG, doing the same journeys I could only manage around 25-30MPG.
 
In order for this test to be anywhere near conclusive, we must all have the ability to drive as they do on the test, with overinflated tyre pressures. If you expect me to drive normally, the results will always be as everyone expects.....wrong!
 
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