I chuckle when I see this on adverts, ‘up to’ means that the percentage efficiency could be anything from 0% to 100%! But we are fooled by the top percentage. It’s the same sort of trick where a price is £9.99 instead of £10.00, the brain is tricked into thinking it’s a more than the 1 pence you actually save!

So think before you buy and be aware of tricky marketing, please!