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Discussion Starter · #1 ·
Can some one give me an idea whats going on id dropped suddenly and i cant get it back i average 37 highway when its highway only and 30- 32 mixed i drive casually used to average 39 mixed and 44 hwy. cleaned the fuel system and still nothing the dealer i was using keeps blowing me off saying its normal and the other dealer doesnt seem to want to mess with it


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I get much worse fuel mileage this time of year when the weather is cold. The car has to run rich while it's warming up and it takes a lot longer. Plus the winter gas mix is less potent with all the additives.

Not sure if this has anything to do with your sudden drop or not, just something to note.

Note: When the air is colder, it's also denser so the computer compensates by adding more fuel to achieve the correct air/fuel ratio. My car also runs much lower boost in the winter because it meets the desired torque figures much easier than the thin summer air. I max out around 10-12 psi in the winter rather than the 15-17psi in the summer.
 
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I get much worse fuel mileage this time of year when the weather is cold. The car has to run rich while it's warming up and it takes a lot longer. Plus the winter gas mix is less potent with all the additives.

Not sure if this has anything to do with your sudden drop or not, just something to note.

Note: When the air is colder, it's also denser so the computer compensates by adding more fuel to achieve the correct air/fuel ratio. My car also runs much lower boost in the winter because it meets the desired torque figures much easier than the thin summer air. I max out around 10-12 psi in the winter rather than the 15-17psi in the summer.
TS has a diesel.
 

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TS has a diesel.
Ah indeed, I came from active topics and failed to notice which section this was in. Good catch.

Originally I thought economy in the low 30s wasn't too out of the ordinary, but for a diesel it does seem a tad on the low side.
 
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To add some to this conversation: Winter blend fuel alone will lower the fuel economy. The stuff that goes in to lower the gel point also typically has lower energy - thus requires more fuel to produce the same amount of energy to move the car.
 

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Discussion Starter · #6 ·
This has been going on close to 6 months its not fuel related or anything i can put my finger on but its way lower than what i should get an i cant get any dealer to lift a finger with it


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To add some to this conversation: Winter blend fuel alone will lower the fuel economy. The stuff that goes in to lower the gel point also typically has lower energy - thus requires more fuel to produce the same amount of energy to move the car.
take a look at my fuelly
i drive the same route year round
mpg is same year round.
 

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take a look at my fuelly
i drive the same route year round
mpg is same year round.
Yikes your Canadian diesel juice is expensive. Last 12 months on my fully I have averaged $1.98 a gallon and 42.2 mpg over 17k miles.
 

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take a look at my fuelly
i drive the same route year round
mpg is same year round.
Well, it's always winter in Canada, so... :)
 

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take a look at my fuelly
i drive the same route year round
mpg is same year round.
Thankfully we do not get the extreme's in temps over here,Like Boraz,my Diesel Cruze gets around 47MPG constantly someetimes even better if I take it easy,mine is mostly hwy driving,thankfully I will keep getting this sort of milage,indydiesel come over here our diesel when you do the conversions is equivilent of $5.50 A per gallon($1.27 Au Avg Per Litre,4 Au Litres to an A gallon)
 

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Discussion Starter · #15 ·
Alright so i changed the air filter and cleaned the map and nothing. No change im still averaging 30 mpg all the time no matter what i do


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Alright so i changed the air filter and cleaned the map and nothing. No change im still averaging 30 mpg all the time no matter what i do


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Were you able to get the fuel economy up? If so what did you do to accomplish it?
 

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I don't have a diesel but my guess would be something to do with the emissions system. Could be possible Regen issue. I assume you have a cat in the exhaust yet. Not sure what normal op ranges are but they will indicate if your cat is plugged up/burned up.
 

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Discussion Starter · #19 ·
The dealer pretty much told me unless theres a light its operating fine, now i have a grinding noise and got a well we cant hear it drive it till it fails response even tho the service advisor can hear it


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The dealer pretty much told me unless theres a light its operating fine, now i have a grinding noise and got a well we cant hear it drive it till it fails response even tho the service advisor can hear it


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Sound like a lazy dealership avoiding warranty items to me lol
 
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