Showing posts with label Bad. Show all posts
Showing posts with label Bad. Show all posts

Thursday, 22 May 2014

Bad Infographic of the Day

Whilst browsing the MoneySavingExpert website over lunch today I came across this good example of a bad infographic:


It appears on the page about cheaper fuel and is intended to illustrate how the cost of a typical litre of unleaded petrol breaks down.

There are two problems with the above graph.  Firstly, most of the percentages shown in brackets are wrong.  For example, a very quick and simple bit of mental arithmetic will tell you that 5p is not 6% of £1.30, but less than 4%.  However, this is not the main problem with the graph.  The main problem is that the areas of the graph are all wrong; it significantly under-represents the portion of the petrol price attributable to fuel duty and to the manufacturer, slightly over-represents VAT and massively over-represents the retailers cut.

I've produced a corrected version of the infographic, which is shown below.  See if you can spot the difference:


MoneySavingExpert claims the data for the infographic comes from PetrolPrices.com; I can't find the infographic there, so I'm guessing that's MoneySavingExpert's own work.  There are a couple of graphics on this page that aren't any better, although they just appear to show the cost breakdown numerically, with the larger numbers written in a larger font to give them more prominence - they aren't quite as potentially misleading.