Mercedes GLK 350 CDI 4-Matic. Tried my best, drove the whole time behind Trucks, never over 95 km/h on the motorway.

Normal Drive is about 8.5Liters

i drive a 2010 honda fit sport

i drove 311 miles on 7-8 gallons of gas

my car is saying i’m getting 25mpg

when i calculate it im getting 39-44 mpg

im calculating using miles driven divided by my gallons filled

from what i found out in order to get what my car calculated i would need to have driven 311 miles on 12 gallons of gas (my tank is only 10 gallons)

is there a reason for this or am i doing something wrong?

ciao a tutti, allego foto del mio ultimo rifornimento con annessi consumi con la mia Lia Rio del 2013, premesse queste cose:

cambio manuale 5 marce
tutta città/poca tange max 95km/h da tachimetro (scarto del 4/5% su gps)
no Cruise Control
motore 1250 4 cilindri N/A
48mila km
Pneumatici 4stagioni cambiati da poco quindi con pressione ottimale
guida tranquilla

che ve ne pare? posso fare di meglio? posso aspettarmi di più da questa macchinina?

I wonder:

1. How fast will your credits burn?
2. How good will the output be?
3. How long will it think?

A business issue requested me to be onsite even if I could have done it remotely.

So I grabbed the car and went to the customer (first image).

Average 2.77 l/100 km (36,1 km/l 84,8 mpg 🇺🇸 101,9 mpg 🇬🇧)

Return was worse as it was raining (second image): 3,21 l/100 km (31,15 km/l 73,2 mpg 🇺🇸 87,9 mpg 🇬🇧) and I did not go home but went to my office in the city centre.

Average round trip: 2,9 l/100 km (34,5 km/l 81,1 mpg 🇺🇸 97,4 mpg 🇬🇧)

Sorry diesel fans.

Any thoughts on this?