Hello I have read various forums on your website. But I need some help / information from experts like you people. I have a cuore not on cng. Its been 16000km running in petrol . every 5000km I go for a periodic maintainence of the car at Toyota company followed by oil change either Shell Blue or Toyotas Oil. Fortunately till now there has been no need of change of plugs or tuning of the car as it is running smoothly and there is no missing at all. The fuel tank is 32 litres but on the max I do get an idea that when to fill the tank. In 31 litres , 350km I get on the roads of the city i.e 11.30 km / litre without AC but with AC around 9km / litre . Still from these calculations is it necessary to go for tuning or change of plugs as the periodic maintanance also covers the wash of plugs via petrol ?? Thank you
