Do following things; Tune engine and adjust tappets, change spark plugs, remove fuel injectors and clean them in ultrasonic bath, Use fuel injector or fuel system cleaner mixed with petrol after every 3000 KM before oil change, change air filter, flush engine by draining old oil, fill engine with 2 liter diesel and start engine and keep at idle speed for 15 minutes. Drain and replace oil filter and add new oil ZIC 5W/20 for optimum performance. Repeat engine flush procedure after alternate oil change. Check wheel alignment, check brakes by lifting up wheel and rotate wheel by hand. If found any wheel not moving freely then repair brakes, Change old and hard tires with normal size i.e, not greater than 195/65/15R, Keep tire pressure up to 32 PSI, Change worn out and weak shock absorbers as weak or bad shocks increases fuel consumption as bad shocks resist free motion of car, check and repair bad suspension parts of front and rear suspension, drive car with gentle foot on accelerator and also try to switch Off engine on long traffic signals. Remove extra and useless material from car diki as extra weight also effect fuel economy. Use A/C wisely as it increases fuel consumption by 10 to 15 %. Check A/C compressor against abnormal load.
