best Economic car

Gud Experience

Very balanced and Informative review and some real good observations. 

While switching from Petrol to LPG it takes a few seconds for the car to fire normally that is what gives the feeling as if the car is braking. 

One minor correction that i would like to suggest about your review. You have mentioned that you are worried about the valve lubrication as Petrol provides it. Well here is the correction. 

Petrol DOES NOT provide any lubrication, infact its the opposite, hence Petrol and LPG both have similar effect, lubrication is done by the engine oil. 
If you have noticed burning petrol does not emit smoke, while Diesel and Kerosene (used in aircrafts as well as for cooking) emit black smoke. This is due to the aromatic compounds present in Diesel and Kerosene. 

The aromatic compounds provide lubrication as well as emit black smoke if burnt. Hence Diesel and Kerosene are lubricating in nature. Kerosene is extensively used for cleaning machine parts due to this reason.