Fuel/MPG

[Jordaan992]

I have a Corsa 2015 Diesel 1.3litre and I am just wanting to know if others are having the same issue. When I fill up and put a full tank of fuel in, I seem to only get 39/40litres and this is when the tank is empty. I have always seen they hold 45 litres but I never seem to get any where near that. 

My other issue is the computer tells me I averaging 56.4 mpg but it is costing me an absolute fortune to run week to week. Just now am alone 80 pounds a week and I am only doing roughly just under 120 Miles So about 460 miles a month. When I first got the car this wasn't an issue a full tank would last me 2/3 weeks doing the same miles but now am getting no where near it.

[Vauxhall Owners Club]

Did you ever find a conclusion to this issue?

That is a crazy fuel consumption and suggests the engine is in dire need of servicing (filters, fluids, decarbonising, etc)