After keeping passo 2006, 2008 and 2009 I came to the conclusion that passos are not very fuel efficient cars. It gives 8.5 to 10 kmpl in local and upto 13/14 on motorways I.e the straight stretch of motorways, the average comes down as soon as you are on an inclined path.
Catalytic converter removal would not effect any sensor etc or fuel efficiency but it would slightly make it better pick wise.
For me passo is a very specious easily maneuverable small city car with below average fuel efficiency.
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