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really terrible mpg need help

6841 Views 39 Replies 15 Participants Last post by  sciphi
i have a 2012 lt that has 5500km on it. i used to get like 8.5l/100km but now i am not getting any lower than 11.4l/100km, i need help because this is a ridiculously low mpg
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Have you checked the usual culprits for a sudden drop in mileage (air filter and spark plugs)? Did the drop happen all at once or has it been decreasing?
 

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Recent cold weather?
Change of temp & longer warm up kills economy.
How far is your commute?
AT or MT vearbox?
 

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You guys will get a lot more help if you can convert that into miles per gallon for us, since most of the members on this board are from the US. Until then, we wouldn't even be able to tell you how far away from typical winter fuel economy you might be.
 

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A 10km commute at 50f barely gives the ecm time to come "on-line".
Monitor the eng temp next trip.

I'm only guessing here but the eng needs 175+ to allow the ecm to go into closed loop.
Have ya checked the tire pressure.
 

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A 10km commute at 50f barely gives the ecm time to come "on-line".
Monitor the eng temp next trip.

I'm only guessing here but the eng needs 175+ to allow the ecm to go into closed loop.
Have ya checked the tire pressure.
These things go into closed loop quite early. It's not a old car that needs a minute or so.

I'd look into the usual suspects such as weather, tire pressure, any changes in usual driving routines/traffic, and letting other people use the car. Some folks are lead-foots that can't get good fuel economy if their life depended on it.
 
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XR and I created a pair of posts/threads that include a laundry list of items that can make or break fuel economy. His is applicable year round and mine is a cold weather addendum to it. Have you gone through these two posts to see if anything on them jumps out at you as a recent change to your car or driving habits? Both are stickied in the Fuel Economy sub-forum. Also, what engines and transmissions do you guys have? It makes a huge difference in fuel economy. Other than OP's opening post, we don't really have a feel for what your car should be getting.
 

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These things go into closed loop quite early. It's not a old car that needs a minute or so.

I'd look into the usual suspects such as weather, tire pressure, any changes in usual driving routines/traffic, and letting other people use the car. Some folks are lead-foots that can't get good fuel economy if their life depended on it.
I'll have to check into this more, because from what I have seen, the car doesn't go into close loop mode until the ECT hits 160 degrees F.



With regard to the terrible gas mileage, it's actually not that bad given the fact that it's winter right now, with winter grade fuel, and the commute is so incredibly short. In fact, 20MPG is pretty good given the conditions. In a 10km or 14km commute, does the car even reach full operating temperature?

I'll bet your fuel economy will skyrocket once the weather warms up.
 

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I'll have to check into this more, because from what I have seen, the car doesn't go into close loop mode until the ECT hits 160 degrees F.

I think this is correct. Also with the automatic the torque converter does not lock up until the 160-175degree range(I'm going by engine temp since I have no trans temp). When driving on the highway with the automatic you will notice the RPMs are higher than normal by about 400-600rpm, once the above mentioned temps are reached the RPM drops to normal.
 

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the 14km commute is all city but with a steady foot and all green lights usually
the car has the 1.4t and the 6 spd auto, i also follow that thread that you made on how to save fuel.
Without adding some highway to your route or eliminating stop signs/lights I really don't think you will see any improvement until the weather warms up.

My girlfriends weekly driving is 100% city with idling(remote start) & never fully warming up the car the DIC reads around 12mpg. Luckily I actually have to drive 30-60miles(about 70%hwy/30%city) round trip when I want to go shopping once a week which brings that poor MPG up to a more reasonable 25-30mpg.
 

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I'll have to check into this more, because from what I have seen, the car doesn't go into close loop mode until the ECT hits 160 degrees F.
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I checked this morning on my ScanGauge II. From a 33*F cold start with the car sitting in 33*F air all night, the car was in closed loop in 30 seconds. Not sure on coolant temperature, but likely wasn't much above 70*F or so, if that.
 
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