Drop in MPG...causes?
Discussion
My old mitsubishi is experiencing a noticeable drop in MPG in the last 2 or 3 months.
It's 22 years old with 142k on the clock, but has been meticulously serviced, isn't due a minor service until august.
MPG has gone from 28/30 with a fairly leaden foot, down to 25 with me driving conservatively....certainly a difference enough to notice...pretty sure if i was driving it like i usually would, i'd be getting that figure down to 22/23.
Any suggestions as to causes of this drop in MPG? Car is otherwise running fine, if a little sluggish acceleration wise. No dashlights, and doesn't feel like the block is running rough.
It's 22 years old with 142k on the clock, but has been meticulously serviced, isn't due a minor service until august.
MPG has gone from 28/30 with a fairly leaden foot, down to 25 with me driving conservatively....certainly a difference enough to notice...pretty sure if i was driving it like i usually would, i'd be getting that figure down to 22/23.
Any suggestions as to causes of this drop in MPG? Car is otherwise running fine, if a little sluggish acceleration wise. No dashlights, and doesn't feel like the block is running rough.
stevieturbo said:
Presumably petrol ?
Are you comparing against a dash reading, or actual brim to brim fuel/miles ?
Same tyres sizes throughout ? Same filling stations ?
Yup, petrol 1.6 Mivec. No dash reading, brim to brim calculation using the same V-power from the same filling station I always use.Are you comparing against a dash reading, or actual brim to brim fuel/miles ?
Same tyres sizes throughout ? Same filling stations ?
Same tyres too
It's been enough to notice a difference, gone from getting 270 odd miles to a tank, to 200.Thanks for the replies.
to address a couple of raised points, tyre pressures are correct, and MIVEC is engaging exactly as it should at 5k rpm and pulling right around to 8k...usually if MIVEC plays up it would cut at 6.5k or not engage at all.
As for Leads, it has two regular leads, and two Coil-on-plugs...the leads are easy enough to source, but the COPs cost a fortune new, and aren't that easy to track down used.
Interestingly, took the car up to nottingham and back from st albans last week, and got 40mpg out of it, which is normal historically for motorway runs in this car.
So, basically it only seems to be exhibiting poorer than usual MPG on short runs, rather than longer motorway trips...not sure if that is telling in some regard?
to address a couple of raised points, tyre pressures are correct, and MIVEC is engaging exactly as it should at 5k rpm and pulling right around to 8k...usually if MIVEC plays up it would cut at 6.5k or not engage at all.
As for Leads, it has two regular leads, and two Coil-on-plugs...the leads are easy enough to source, but the COPs cost a fortune new, and aren't that easy to track down used.
Interestingly, took the car up to nottingham and back from st albans last week, and got 40mpg out of it, which is normal historically for motorway runs in this car.
So, basically it only seems to be exhibiting poorer than usual MPG on short runs, rather than longer motorway trips...not sure if that is telling in some regard?
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