This seems really low considering I’m just under half a tank? I know it changes based on driving, but this is after a drive. Just passed fresh MOT so nothing major as I’d assume it would have been picked up and I can easily average anything from 48-54mpg on a 25 mile round trip. 
 

MK7 Fiesta Zetec S 1.6L 

That fuel 'computer' is nothing but a toy. The only true way to measure mileage is to brim the tank full, drive to a quarter tank left, full up, and calculate exactly what fuel your car has used over your driven mileage, not what a microchip thinks it uses...

32 minutes ago, StephenFord said:

That fuel 'computer' is nothing but a toy. The only true way to measure mileage is to brim the tank full, drive to a quarter tank left, full up, and calculate exactly what fuel your car has used over your driven mileage, not what a microchip thinks it uses...

Thanks! I’m gonna run it down to pretty much empty first then fill it up reset my trip miles and then down to quarter of a tank see what happens. Last time I did that I was lucky to get 200 miles of mixed town and “long runs” I know the fuel tanks are small but so annoying not be able to get at least 250 to 3/4 of a tank.. 

6 minutes ago, rt95 said:

... Last time I did that I was lucky to get 200 miles of mixed town and “long runs” ...

You need to change your mindset. Getting '200 miles' is a useless bit of info. (As you have little idea of how much fuel you needed to achieve that) The only true measurement is MPG.

I always brim my tank, set my odometer to zero, then do the same again next trip to the garage. This gives you an accurate ongoing statistic of what mileage you get...

1 hour ago, StephenFord said:

You need to change your mindset. Getting '200 miles' is a useless bit of info. (As you have little idea of how much fuel you needed to achieve that) The only true measurement is MPG.

I always brim my tank, set my odometer to zero, then do the same again next trip to the garage. This gives you an accurate ongoing statistic of what mileage you get...

Do you reset your average mpg after every garage stop?

17 minutes ago, rt95 said:

Do you reset your average mpg after every garage stop?

There would be little point since it is exactly that "an average" mpg.

Personally I don't usually reset my average mpg as I like to kept a check that it doesn't start changing by significant amounts without reason. The display  of range is only an approximate or best guess of how many miles the car may get. It can increase as well as decrease depending on changes in driving.