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how much the manufacturer has fiddled the test / elaborated the results
sure but the current VED bands are based on some number plucked from somewhere and there aren't people complaining about the way the numbers were created
So mile x vehicle weight x efficiency x alternatives available for that journey x congestion with a GPS tracker plugged into your ODB port. Glad we all agree.
Can the tracker have a Multipass slot and biometric reader? No licence, no moving.
FTFY