Ask Honest John

Honest John Ask Honest John » The mpg on my car's dash differs from my own fuel consumption calculations - is this unusual?

The mpg on my car's dash differs from my own fuel consumption calculations - is this unusual?

I have a Jaguar XE, nearly two years old, which averages around 39mpg on the computer set for long periods. 2000 miles ago I decided to check real mpg by checking fill-ups against mileage and was surprised to find a figure of 35.5mpg. Is this unusual?

Asked on 5 October 2017 by JGH

Answered by Honest John
No, it's typical. Car mpg computers always show better than the truth.

Real MPG enables you to register the fuel economy you are actually getting against your make and model of car, its engine and type of transmission.

Every time you enter an average consumption figure against your car, the overall average automatically adjusts to reflect it.

Real MPG
Similar questions
I recently purchased a 2015 Vauxhall Astra diesel 1.6 CDTi, attracted by the high quoted MPG of 76 (combined). I always calculate the cars MPG when I fill up, as well as recording the figure the car says....
I've been monitoring the mpg of my 2012 Mercedes-Benz ML250 since purchase. I would say 95 per cent of my driving is done around London. According to http://www.honestjohn.co.uk/realmpg/mercedes-benz/ml-class-w166-2012/ml250-bluetec...
Can you please advise which of the largest size petrol vehicles available to purchase does the most miles per gallon?
Related models
Superb ride comfort and fuel economy. Eight-speed automatic is excellent. Interior is much improved from 2019.
 

Value my car

Save £75 on Warranty using code HJ75

with MotorEasy

Get a warranty quote

Save 12% on GAP Insurance

Use HJ21 to save on an ALA policy

See offer