Conclude Report about no economy ,bad performance Automotive engineer of 6 parts (The underground racing mechanicals) in all brands which mean brands failure in automobile thus forever (mean permanent).
1. Wider rear track than front track dimension chassis : easy wrecked chassis,the lowest traction,extreme tail flick,extreme slip,hardcore control in all speed and economy as 1-5 km/l,below 1 km/l (below 0.90g in 0.70g traction level).
2. turbocharger (1-4 turbo per engine) intercooler petrol engines : unstable acceleration,extreme wrecked engine parts,torque horsepower overload, and economy as 1-5 km/l,below 1 km/l.
3. without rear fog lamp : easy electronic parts wrecked,economy as 1-5 km/l,below 1 km/l.
4. CVT transmission : slow acceleration,economy as 1-5 km/l,below 1 km/l.
5. Wider front track than rear track in below 10 mm dimension chassis with FWD,RWD,AWD : medium traction,tail flick,easy slip and economy as 1-5 km/l,below 1 km/l (below 0.90g as 0.85g traction level).
6. Front track as same as rear track dimension chassis : medium traction,medium tail flick,easy slip,power slide,understeer and economy as 1-5 km/l,below 1 km/l (below 0.90g as 0.80-0.85g traction level).
If over 1 of 6 parts,automobiles of economy use 1-3 km/l,below 1 km/l.
All brands database test performance
I just report about their performance economy brands vehicles series with specification & standard equipment about disadvantage on automobiles market and effect in EV(recharger too many),Hybird too.