Hi Friends, I have bought a 1996 Mitsubishi Magna TE executive. The average fuel consumption that i have heard from many people is about 500kms/tank. To check the efficiency of my car i had filled up the fuel tank and it gave me 250 kms for half a tank which was as expected. But as soon i reached the half tank mark the efficiency went down and i could see the fuel level fall down (gauge) rapidly as i was driving. In the remaining half tank i have managed to get only around 150 kms. Seeing this pattern i wonder if there is a problem with my gauge? I have bought this card second hand and it has 200,000kms done. Also i drive it as carefully as possible (along with monitoring Tyre pressure) and try to extract maximum fuel efficiency. What can i do to improve my fuel efficiency?

Replace air filter
Replace fuel filter
Choose thinner oil
Change oil filter
Clean throttle body
ECU reset
Check tire pressures
Check wheel alignment
Lose weight
Take unnecessary crap out of the car
Remove roof racks
Keep windows up above 80km/h
Don't use Ethanol fuel

Did I miss anything? I wouldn't worry about the gauge, I'd fix the consumption first. I get 500+ to a tank on a 270,000km motor in peak hour traffic.

If the above doesn't help, you need to start diagnosing sensor issues.

magna gauges always drop quicker after they've reached half way. just the shape of the tank and a lack of compensating for it with the fuel gauge i would say.

it is halfway when you factor in the 100kms or so on the fuel light.

Best you fill up and then record milage for L used