Regarding tax benefits, I'm self employed and for anything over 130g/km C02, 30% is immediately disallowed as a tax deduction. When I was considering my next lease the GLC 220d (and 250d) was under 130 but for whatever reason it is now quite a bit over 130. This is annoying as I can only claim a maximum of 70% of the costs of the vehicle against tax. Have manufacturers been forced to re test co2 emissions after the vw scandal?