how much would my fuel costs increase by if upgrade to 1.6??

ferox666

I currently drive a car with only 1litre (973cc) engine and 135 g/km CO2 emissions. If I switch to a 1.6 with 199 g/km what difference (in % terms) would it make to my fuel costs?

Vehicle 2 apparently average mpg 32.8 mpg the other was 50-odd so does that mean it would increase by around 50%?

hope someone can help, thanks!

PeacefulWaters

50 odd divided by 32.8 is the answer. So in excess of 50%.

Hintza

How do you know what your current car gets? Have you calculated your mpg? If not, do so.

Ultrasonic

Do as Hintza says and calculate what mpg you actually get in your current car.

What cars and engines are we talking about?

Rather than going with the official mpg figures you will probably find data on the following two sites more representative of real world driving:

http://www.honestjohn.co.uk/realmpg/
http://www.fuelly.com

If your concern is financial rather than environmental then you also want to factor in the difference in VED ('car tax').

johnmc

I have never yet managed to achieve the advertised mpg. It will depend on how you use the car and on how you drive.

It is reasonable to use the advertised values for both vehicles as a rough guide. Have a look on www.parkers.co.uk

Ultrasonic

johnmc wrote: »

I have never yet managed to achieve the advertised mpg. It will depend on how you use the car and on how you drive.

It is reasonable to use the advertised values for both vehicles as a rough guide. Have a look on www.parkers.co.uk

The issue is that the difference between real world and official mpg figures is growing, so that if the 1.6 is a much more modern car then the official comparison is likely to exaggerate the difference that the OP will actually see.

(Driving economically I've achieved approximately the official combined mpg for all cars that I have owned, but I suspect I would struggle to do so with a brand new car.)

phill99

It may actually be very little. Smaller engines often struggle with the weight if the body and therefore use a relatively high amount of fuel for their size. A larger engine on a small body gives better performance as it's not being strained.

You can't do a straight engine size comparison. It depends in too many factors. Age of car, servicing, driving style, tyre pressure, amount of rubbish carried in the boot etc will all impact the mpg.

yangptangkipperbang

The "Official" mpg figs have never been a guide as to what an owner would get from that car. They are done under laboratory conditions and manufacturers "adjust" the vehicle to get the best of it. They are solely intended as a guide to compare one vehicle to another.

Last year I changed from a 1.6 Ford to a 1.4 - the official figures said that I would get much better fuel economy - I didn't, it was worse !
6 months later I am now getting better than my last car but still not up the the brochure figures.
The performance of the new car is barely distinguishable from the old (I don't have a stopwatch !!). However what is very noticeable is the difference in the gearbox ratios which makes a huge difference to the mpg. On the previous car I had to drop to 4th at 30 mph - this one potters along quite happily in 5th at 30. Once I got used to this the mpg figures started to improve.

Ultrasonic

yangptangkipperbang wrote: »

The "Official" mpg figs have never been a guide as to what an owner would get from that car.

I don't entirely agree with that, but either way the important point is that the gap between offical and real-world figures is growing. See e.g. this report:

http://www.theicct.org/sites/default/files/publications/ICCT_EU_fuelconsumption2_workingpaper_2012.pdf

(Just look at Figure 4.3 if you don't want to read it all.)

vaio

I guess in (very) round terms CO2 emission is proportional to mpg so if you use 135 litres a week in your current car then you'll use 199 litres a week in your new car, an increase of about 50%

Obviously subject to driving style and car marketing lies but probably not a bad starting point.

takman

Emissions are linked directly to how fuel efficient the car is. 199 g/km is high so it doesn't sound like a very fuel efficient car.
But a lot depends on your driving style. In my car if I drive fuel efficiently I always get more than the combined mpg and I can achieve the extra urban on an extended journey.

I would recommend filling the tank up in your current car and driving around till it's near empty then fill it up again and accurately check your current mpg.