Incorrect mpg
 

Hiya, if you look at my fill ups I have to average mpg 25.2 and 24.6, yet my dashboard claims I am getting 31.6mpg ....

What gives?

Thanks

26 is the US MPG average. 31.6 is the UK MPG average. Make sure you click the 'UK' link under the Fuelly logo and reload the page.

Hi,

Still doesn't make sense, seems more that something is calculated wrong.

I have been using the UK link thanks, but on my fuel up stats under Log Book it says "UK MPG" and I have two results, 25.2 and 24.6. My car has never managed 30+mpg that I know of.

Anyway my badge shows 31.6 UK mpg. I believe my partial fuel up hasn't been accounted for properly.

If I do the calculations myself I get 21.16mpg and 24.57mpg (both UK), so the log book is wrong, but the badge is way out.

I think there is something wrong with your script, like it's doing a US to UK conversion on my UK mpg data?

Anyway it's making my car club think I drive like an old lady :)

Thank you for the quick response, and great site, really like it thank you :)

Whilst I'm testing, I go to the Signature page, and it says 31.6 UK MPG, if I change it to US MPG it still says 26.3 which is too high again.

It seems more that the partial fuel up I did has been used for the average calculation which wouldn't work.

Hope that helps,

Russ

Just re-read my first post - I meant "the log book is right", not wrong lol my bad, sorry.

It's a good idea to try to avoid partial tanks since they are useless for calculating mpg (it takes fuelly 2 proper tanks to recover). Just fill it to the top each time.

Thanks for the heads up on it taking time to recover, but I'm not going to change my fuelling to suit Fuelly.

Fuelly just needs to be programmed better to not go wrong when it comes to a partial fuel up and just ignore it when calculates averages :)

Thanks

Just saw you're getting 75mpg! Crazy, good for you! I'll pay more attention to A2s when someone is looking to change their car :)

Fiat Punto and Kia Rio do 97 and 94 MPG if youre trying to maximise economy btw!

It looks like you have some fuel-ups out of sequence. Take a look at your View All Fuel-ups page here. Your fuel-up on September 24 has an odometer reading that is lower than your previous fill.