That motorway journey should have given you a good regen, so a mystery.
for blanking the EGR, you will get more responsive throttle response, especially off the line ( I was shocked at the difference). It will also help mpg, and reduce long term clogging up of your engine. You can also get EGR restrictor ( the same plates with small holes in), these give some of the benefits, but mean you don't need some sort of dongle or remap to stop the engine light coming on.
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