I recently bought a second hand 2004 mitsubishi magna ES 3.5L 6cyl sedan, and everything is real nice on it apart from one thing. when i bought it off the seller he said the fuel gauge didnt work, but as long as i reset the trip to 0 every time i give her a full tank i should be right, coz it gets about 400k's to every fill. so just before i went to the servo and gave her a full tank and reset the trip meter but when i got home, which was a very short stop start drive it said that i was doing 21.1L/100km, is this just due to the drive being very stop start or is there another problem? when i first bought the car it said it was doing 12.7/100km

Before I answer this can it be moved to the right section, please Mr Moderator, Sir??

Moved to 3rd gen section.

Was that AVERAGE fuel use or INST use, cos they're not the same.
And only 400 kays on a full tank? Seems a little low, even if you're...... spirited in your driving style.
Both those readings are indicative only, and to be taken with a small grain of salt.
I'd fill the tank, watch the 'fuel used' until it hits about 68 liters (assuming it's a sedan) see how many kay's you got and that should keep you in reasonably good stead.

Instantaneous fuel consumption is all over the place. Some examples:

Me backing out the driveway with cold engine = 60L/100 km. lol
Short 200m trip to shops, cold engine = 22L/100 Km.
100 KPH, steady speed = 9L/100 km.

Current average over 250 km = 13.5L/100 Km.

i average 440-460kms out of a tank of my ralliart and that is with mostly city driving some highway and a few spirts. after driving spirited today it was showing me 15L/100

http://www.aussiemagna.com/forums/showthread.php?t=35083

i have a 03 LS wagon, on 95 octane i get a maximum of 490kms. That's city driving and with the occassional boot. But i don't take off hard...

you lot cant be serious? - our old ralliart, the TJ and the KJ wagon we used to have used to get us between 600-700km a tank, and thats city and country driving.....in all 3 vehicles

you lot cant be serious? - our old ralliart, the TJ and the KJ wagon we used to have used to get us between 600-700km a tank, and thats city and country driving.....in all 3 vehicles

I agree - currently getting about 580 - 600km out of a tank around town with a (ahem) slighty enthuastic driving style. (95-98 RON used only)

I get 500-550km max from my tj2 manual sports

you lot cant be serious? - our old ralliart, the TJ and the KJ wagon we used to have used to get us between 600-700km a tank, and thats city and country driving.....in all 3 vehicles

by city are you driving 0-60 in 50 meters then hitting another traffic light and continually doing that for 1 hour straight daily? or more :P