Problems with Wagon R Duo Mileage

23.1 ltrs in a tank designed for 22.5 litres is quite comon ....... primarily for any of th following reasons.....

1. most pumps across th country are advance caliberated by 2 to 5 % ... which mns an actual quantity of 22.5 ltrs wud show ..........23 to 23.5 ltrs

2. lpg pumps usually fill at a pressure of between 8 & 10 bars .......... th 10 bar pressure pumps usually manage to pump in a lil more quantity than th slower pump .... before it is switched off

3. if there is a delay in switching off th dispenser after th tank is full ..... some more gas continues to get pushed into th tank

this factor has no relevance wotsoever to th present issue ........ how 23.1 ltrs got filled in ... in a tank designed to carry only 22.4 ltrs

litres ... is a measure which relates to volume ... and not at all to density

th tanks capacity of 22.4 ltrs relates only to th volume of 22.4 ltrs  irrespective of whether th density of lpg is a lil more or or a lil less

similarly .......th lpg dispenser also measures by volume ............ and wud read th same quantity .... irrespective of whether th density of lpg passing thru it is slightly more or slightly less at that point of time

therefore ......... th lpg dispenser showing 23.1 ltrs lpg filled in .. in a tank with a maximum rated capacity of 22.4 ltrs ... cannot possibly b bcoz of th density of lpg being a lil less or a lil more

this is a typical example of how some technical tidbits being picked up from here n there .... and applied indiscriminately in irrelevant situations .... succeed in creating fresh myths in th minds of innocent readers ... rather than contributing in banishing old ones

this factor is also not applicable for exactly th same reason ...... as elaborated in my previous post ........re density of lpg

simply put .......... if bcoz of som pressure diff .......lesser volume of lpg goes into th car's cylinder ........... th car's cylinder cannot signal .'full' .... unless adequate'volume' goes into it

lpg pumps do not hv any cut-off pressure at all ................

so th q of more or less lpg going into th car's cylinder ... for this reason ... does not arise at all

th 'cut-off' or th signal that th tank is full is generated not by any cut-off pressure in th lpg pump .... but by th car's cyinder

this signal is noticed by us as a metal to metal clanging noise from th car's inlet .... and in some lpg pumps also in th shape of some vibration or noise in th dispensing pipe ...... when th cylinder refuses to accept more lpg .............. and not bcoz of any cut off pressure in any lpg pump

what mileage shoule be expected in mumbai city driving with AC ON using WAGON R DUO. City driving is primarily on chembur to lower parel and high way driving is vashi to chembur.

any one with strong views about WAGON R DUO? is it economical choice than going in for SWIFT Diesel.

thanks

manish

WagonR DUO LXi will cost Rs.3.93 lac while Swift LDi Rs.4.90 - a difference of almost Rs.1 lac.  DUO will give a mileage of 12/14 in city & 16/18 on highway while Swift LDi will give 16/18 in city & 20/22 on highway - depending on driving conditions & style.

Both these cars are good & fuel efficient.  Running cost (per km) of DUO & Swift both will work out to more or less same - Rs.2.25 in city & Rs.1.75 on highway. 

However, running cost of DUO will reduce considerably if Domestic LPG Cyclinder (14.2 kg) is used for refilling, as it's cheaper and also because density of 1 kg LPG is equivalent to 1.66 litre LPG.  However, using domestic LPG cyclinder is illegal - though many manage to use it.

1. th duo owners i hv come across in mumbai ........ are perennialy cribbing abt dismal avg of between 8 & 10 in city

2. Besides being illegal, ............. transferring lpg from domestic cylinder is also highly hazardous

3. also ....... an apparent impression has been created that both autolpg and domestic lpg r th same ..... that there is no harm in using either of them per se ................... plz b warned use of domestic lpg in cars is a sure shot formula of ruining ur luvly car's engine in 2 yrs flat

Yes Vidhur, I agree that mileage in Mumbai & metros are lower than the mileage generally derived by any car.  Therefore, the running cost calculated by me is on slightly lower side for both the subject cars (in Mumbai). Anyway, the running cost of WagonR DUO & Swift will remain more or less at par with each other.

Can you please elaborate as to why use of domestic LPG ruins the car engine. Thanks.

lpg has no distinguishable smell of its own per se ....... therefore substantial quantities of an agent with a distinct smell is added to lpg by th oil companies and over th yrs v hv come to identify this smell as lpg. .......... this agent is identifiable as th black oily slick seen on th burner of th lpg stoves in kitchen or th black stale oil like substance which has to b drained from th lpg system of domestic cylinder run lpg cars periodically

not lpg per se .... but it is this additive in domestic cylinder which cotains high dosages of sulphur .... which is th culprit which ruins th engine over a period irretrievably

autolpg has very mild dosages of this additive that too in modified form which do not harm th engine

domestic lpg users will testify abt th presence of this black stale oil like substance ... while autolpg users will wonder wot on earth r v talkin abt

while autolpg improves th health of th engine .... domestic lpg ruins it beyond repair