Poor mpg on 2008 Is250
#1
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Poor mpg on 2008 Is250
So i recently bought a 2008 IS250 and i feel like my mpg SUCK!!
The average tank reads about 14.3 mpg and i feel like the needle just keeps droppig. What could be wrong?
The average tank reads about 14.3 mpg and i feel like the needle just keeps droppig. What could be wrong?
#3
Pole Position
Try resetting the ECU by disconnecting the negative terminal on the battery for 10-15 minutes or removing the two fuses 2-5 minutes . You can also try cleaning the MAF with some CRC MAF cleaner.
Check the service history to see if the spark plugs have been changed.
Try some fuel system cleaner also.
Check the service history to see if the spark plugs have been changed.
Try some fuel system cleaner also.
#4
Driver School Candidate
That certainly isn't good...Id check the computer against good old math on the next fill up just to spot check it. My '08 IS250 AWD computer has been spot on. The worst I've gotten is 21.5mpg since I've bought it this past June. Best was 31.8 on a 250 mile round trip to the NJ shore....with tons of stop and go traffic. I average 24.5 during my mixed commute on a constant basis.
Check tire pressure (cheap tires can suck up to 1.5mpg also)
Possible clogged fuel injector(s)...try some top end FI cleaner...Amsoil, Royal Purple...Techron...Red Line
Spark plugs.....(PIA to change BTW)
MAF sensor cleaning (easy)
Dirty, clogged air filter ?
Check tire pressure (cheap tires can suck up to 1.5mpg also)
Possible clogged fuel injector(s)...try some top end FI cleaner...Amsoil, Royal Purple...Techron...Red Line
Spark plugs.....(PIA to change BTW)
MAF sensor cleaning (easy)
Dirty, clogged air filter ?
#6
Super Moderator
Seriously, my record low for gas mileage was 17MPG on a tank with winter gas, temps in the teens and single digits, and nothing but short trips. With a mix of suburban and highway driving this time of year, I'm doing more like 23-24. And that's with an IS350.
As other suggested, do a manual calculation to confirm the numbers you are seeing on the trip meter.
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#11
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Since i have posted this i noticed that my mpg has increased tp about 20mpg. Someone told me it was probably because the ecu had been reset and it was still not used to my driving habits. Not sure at all on how true this is though.
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