Bad mpg?

[Klajdi]

Hello... I recently bought a 2013 auris 1.6 v-matic and Im not sure about the mpg its getting. In the city (London) it seems to get around 29.5 mpg and on the motorway around 30. My cousin has a 2007 auris 1.6 also automatic and it does around 31.7 mpg in the city. I filled up the tank and the cruising range was 322 miles. Is this normal for the  age of the car or am I missing something? 

[Cyker]

Does seem a bit low... I'd expect in the 40's - The HJ website also suggests it should be higher.

https://www.honestjohn.co.uk/realmpg/toyota/auris-2007

https://www.honestjohn.co.uk/realmpg/toyota/auris-2013

 

Of course, it does depend a lot on driving style...

 

[Klajdi]

43 minutes ago, Cyker said:

Does seem a bit low... I'd expect in the 40's - The HJ website also suggests it should be higher.

https://www.honestjohn.co.uk/realmpg/toyota/auris-2007

https://www.honestjohn.co.uk/realmpg/toyota/auris-2013

 

Of course, it does depend a lot on driving style...

 

I drive in normal style... Nothing crazy... 

[Cyker]

It's a little tricky to say as city driving, esp. London usually badly affects mpg since you're often crawling or stationary, esp. in higher capacity petrol engines. Doesn't help they've utterly wrecked the road system there making traffic and pollution worse!

Is the 30 on the motorway an average that includes the city driving, or did you reset it just for the motorway part? Definitely should be better than 30 on the motorway - Even the GR Yaris can beat that!

 

[FROSTYBALLS]

The two Auris mentioned (2007 and 2013) aren't directly comparable as they use different transmissions - 2007 Multi Mode Transmission and 2013 CVT. Also the engines, although both 1.6, will differ - the earlier engine will be the lower powered, less efficient  VVTi, and the newer engine will be the more powerful, more efficient Optimal Drive Valvematic.

Honest John's Real mpg suggests consumption for the 2013 should be between 29 and 47.

Where are you getting the consumption information from - the car's readout or using a brim to brim calculation (which will be more accurate)? Mileage? Has it been serviced recently? Are the tyre pressures correct? Have you zeroed the fuel consumption information since you bought it? Also filling up with less than 15 litres can adversely affect the range readings.

Try disconnecting the Battery for 10 minutes which will reset things, and then calculate the consumption when next filling up. 

[Klajdi]

8 hours ago, FROSTYBALLS said:

The two Auris mentioned (2007 and 2013) aren't directly comparable as they use different transmissions - 2007 Multi Mode Transmission and 2013 CVT. Also the engines, although both 1.6, will differ - the earlier engine will be the lower powered, less efficient  VVTi, and the newer engine will be the more powerful, more efficient Optimal Drive Valvematic.

Honest John's Real mpg suggests consumption for the 2013 should be between 29 and 47.

Where are you getting the consumption information from - the car's readout or using a brim to brim calculation (which will be more accurate)? Mileage? Has it been serviced recently? Are the tyre pressures correct? Have you zeroed the fuel consumption information since you bought it? Also filling up with less than 15 litres can adversely affect the range readings.

Try disconnecting the battery for 10 minutes which will reset things, and then calculate the consumption when next filling up. 

I got the mpg from the screen readout. The reason I compare the two auris is not because I think they're similar but because I think the newer one should get slightly better mpg, probably. The car has 67k miles and the books say it was serviced in March this year at 63k miles. The fuel consumption info was zeroed when I bought it. I don't really know how to calculate the fuel consumption on my own to be honest. 

[Klajdi]

8 hours ago, Cyker said:

It's a little tricky to say as city driving, esp. London usually badly affects mpg since you're often crawling or stationary, esp. in higher capacity petrol engines. Doesn't help they've utterly wrecked the road system there making traffic and pollution worse!

Is the 30 on the motorway an average that includes the city driving, or did you reset it just for the motorway part? Definitely should be better than 30 on the motorway - Even the GR Yaris can beat that!

 

It was reset in Nottingham where I got the car and the read going up as I was driving to London. It reached around 30.5 mpg on the motorway and went down to ~29.5 when got to London. 

[Catlover]

You cannot wholly rely on car instruments when you want an accurate reading. Accurate way is to fill the car up until pump stops, do a bit more till the pump stops a second time. Take a note of car miles, or zero a trip setting. Use the car, the more miles you do the more accurate the end result will be. Go back to the same petrol pump, if you can. Fill up until pumps stops, do a bit more till it stops again. Note how many litres/gallons you put in. Note how many miles you travelled since the first fill of the test. Do the sums. Result = fairly accurate mpg.

[TonyHSD]

1 hour ago, Catlover said:

You cannot wholly rely on car instruments when you want an accurate reading. Accurate way is to fill the car up until pump stops, do a bit more till the pump stops a second time. Take a note of car miles, or zero a trip setting. Use the car, the more miles you do the more accurate the end result will be. Go back to the same petrol pump, if you can. Fill up until pumps stops, do a bit more till it stops again. Note how many litres/gallons you put in. Note how many miles you travelled since the first fill of the test. Do the sums. Result = fairly accurate mpg.

+1 for that advice👌, spot on and the best way to find your real world consumption 👍 
Tyres pressure should also be checked in the morning on cold before drive off, and the brakes for binding, these two can increase fuel consumption significantly, plus remember the weather is getting colder now and taking into account driving in town 30mpg imo is about right . Forgot to mention, new E10 95 petrol also affects efficiency by 5-10%. Using E5 99 is better for your engine and economy. 

[Mooly]

1 hour ago, Klajdi said:

I don't really know how to calculate the fuel consumption on my own to be honest. 

Either fill the tank to the first "click" of the nozzle (when it automatically cuts off) if you feel that is repeatable or even better brim the tank full. Now reset the mileage trip to zero or write down the mileage. Now drive normally as you would until the tank is around quarter to a half full. When you fill up you do as you did at the start, either to the nozzle click or brim full. You must do exactly the the same so it is filled to the same point. Write down at the pump how many litres you put in and write down the mileage at that point.

Now go home and work it out...

Example, from brim full and you then covered 273 miles and then filled up again a couple of weeks later. Mileage when you originally filled up was 63456. On the second brim fillup you put in 28.65 litres and mileage is now showing 63729.

You divide 28.65 litres by 4.54 to get gallons. So you put in 6.31 gallons of fuel. 

You divide 273 (mileage covered) by 6.31 to get the miles per gallon which is 43.26 mpg. 

If you also reset your cars mpg reading at the start of doing this (when you do the first brim fill) then you can compare the cars calculated reading with a genuine worked out real result.