&gt; Very easy to fix. Monitor the driver&#x27;s behavior in terms of the way they use the vehicle (accelerate, brake, etc), and charge them accordingly.<p>Car2go (Smart) does exactly this... only they disguise it as eco-score (there&#x27;s some trees on your dashboard and according to your driving style they grow or shrink). Given my last car was an 1994 BMW 318is, it took some time until I managed to get my driving style under control until I got my license yanked away (but that&#x27;s another, totally unrelated story...)