Well lab conditions are very different to real world conditions of course, they only go up to 40 MPH for a start. But the 99 MPG figure was apparently achevied on an empty race track, again, pretty unrealistic but to be fair, road conditions are similar here, empty roads with 0 traffic. I think I would be able to get close to those figures given the chance.
Euro emission regulations are the main reason, getting stricter and stricter, the easiest and quickest way to emit less carbon is to simply burn less fuel.
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