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Chaley
Emissions like NOx and particulate are not directly related to fuel consumption. CO2 is though.
What you are effectively seeing is how much the manufacturer lied about the fuel consumption or how well they cheated the test. Plus between 2006 and 2016 didn’t the tax bands change and/or wasn’t there a change in the way they were tested?
I laugh at your 54mph. My 2005 Insight does 60mpg in traffic in the burbs and I can push it well past 100mpg on a motorway journey. But I have to pay £200+ tax and it’s not ULEZ compliant despite being one of the cleanest production engines ever built, because it’s a pre-2006 Japanese import.