I don't think its politics, just sloppy reporting - trying to dumb down the figures to something people understand - and I agree with you
I
have kept a record and its more than £10 on my small hatchback
Ironically the investigation has been called for by people who charge more for fuel than others. It won't make any difference though - the supermarkets will outprice anyone because they hand out discount vouchers with shopping - spend more than £50 get 5p a litre off.
We take whichever car is the emptiest.
EDIT - Yorkshire tea is also getting more expensive too.