I noticed a similar trend on a jaunt round part of the M25 on Tuesday. Traffic was surprisingly light, but many people appeared to be cruising along at a rate just quick enough not to get tangled up in the HGVs - apart from the occasional Tesla driver wafting past at 80 with a superior look on their faceMany other drivers did seem to be adopting a more economy-focused driving style though - presumably to get the most mpg from their fuel.