Really bad MPG since winter hit??

[omodos]

Originally Posted by Rockit

Any fuel injected vehicle tend to run richer in the winter. Install of bottle of this to make sure your injectors are clean. My gas mileage jumped after a bottle of this and a full tank run through.
LIQUI MOLY - Motor Oils, Additives, Car Care - Products - Fuel Injection Cleaner

As a 3.0d owner shouldn't really be posting here, but I used redex additive yesterday when i filled up and my consumption went up from 29.2mile per gallon to 33.1 mpg....I guess the additive must have done something as nothing else has changed on the vehicle, and the gas station and fuel i use is the one i always use.....

[TiAgX5]

Originally Posted by Moezer

In the summer I put in a cold air intake, its still on the x5, should I put the stock intake back in to it?

Could it be that the intake is sucking way too much cold air and causing the engine to run richer then it should that makes it drink gas like its nothing?

thanks for any help

The cold air intake will not cause a rich condition. The O2 sensors measure the exhaust gas and cause the ECM to adjust the fuel injector pulse width to deliver the correct air/fuel ratio (cold air will cause a wider pulse and deliver more fuel, and make more power).

Even with a carb'ed motor, cold air causes a LEAN condition if jetting was set for hot weather.

[Moezer]

Well the "cold air intake" I got it because I love the sound of the V8 with it on, also the X5 was averaging 800+ kms in the city in summer time.

it only has 95k on it not miles I do not wait tell the X5 to warm up to drive it, as it states in the manual start it and drive right away but slowly, I tested this last time it was -30 or so I let it sit there to warm up and after 15 mins the needle wasn't past the blue temp marker so I know the X5 warms up better when u start driving it right away.

Also since I got the X5 I tested like 7 gas stations and the best gas mileage I got was from PETRO CANADA was the best kms I got to the tank and 2s in line was SHELL V POWER gas.

I only put 91 oct gas in it, I have tried 94 from PETRO CANADA but the x5 didn't show any increase in power or mileage.

I also try all of the time to fill from PETRO CANADA gas stations only and not get mixed gas from other stations.

On last nights fill up I added a can of SEA FOAM to the tank, but im going to put the stock intake back in just for the winter and see if I get somewhat better gas mileage in the winter

[stabmasterflex]

Well im up in edmonton and got 436kms on a tank last week. Thats in my 4.6, my 4.4. got around 470kms the same interval. Its harsh and sitting in traffic isnt helping.

[Moezer]

Originally Posted by stabmasterflex

Well im up in edmonton and got 436kms on a tank last week. Thats in my 4.6, my 4.4. got around 470kms the same interval. Its harsh and sitting in traffic isnt helping.

but to lose 300kms+ wow lol

[TerminatorX5]

the octane rating has nothing to do with energy packed in a liter/galon of fuel... all it is a retardant index that prevents the fuel from self-igniting under high pressure (sport engine, higher compression ratio, fuel self ignites before spark, piston knocks!!)... since that type of fuel is marketed to "sports" cars, that tend to be more expensive, the refineries sell it for more money (even though it is less "flammable") and also can afford adding more detergents and other additives, to make it more attractive to potential buyers...

Why the mileage has gone down in winter - i have no idea... mine has gone down a bit too, to about 16 MPG in a 2006 4.8iS, my driving is mostly highway but sometimes the highway is moving slower than city traffic... lol... I pull about 400 miles off a tank, give or take...

[ukrcan]

Moe, I am not sure how you were getting 800km+ in the city... i never get more than 750-800km on a highway when driving at around 90-100km/h... but to get 800 in the city... i've never heard of anyone getting anything even close to that... in a diesel maybe but not with a 4.4... i average about 500 km in the city (i do have a heavy foot) but in order to get 800 you would need to get around 10l-11l/100km at most... i think our cars are rated at 15-16l/100km in the city and 12 on the highway...
And i do get a bit of decrease in fuel consumption, but nothing significant

[JCL]

Biggest impact on fuel mileage is the driver and driving habits.

2nd is probably ethanol content of the specific fuel (the actual content, not what they claim it could be on the dispensing pump)

Winter mileage drops are often associated with more idling time. Also, check tire pressures since they will drop with the cold ambient temperature.

[Moezer]

Originally Posted by JCL

Biggest impact on fuel mileage is the driver and driving habits.

2nd is probably ethanol content of the specific fuel (the actual content, not what they claim it could be on the dispensing pump)

Winter mileage drops are often associated with more idling time. Also, check tire pressures since they will drop with the cold ambient temperature.

I do know that ethanol is added to almost all the damn gas nowadays, but some shell gas station if you look around it says right on the pump that shell V power 91 oct has no ethanol added

[Clockwork]

Originally Posted by ukrcan

Moe, I am not sure how you were getting 800km+ in the city... i never get more than 750-800km on a highway when driving at around 90-100km/h... but to get 800 in the city... i've never heard of anyone getting anything even close to that... in a diesel maybe but not with a 4.4... i average about 500 km in the city (i do have a heavy foot) but in order to get 800 you would need to get around 10l-11l/100km at most... i think our cars are rated at 15-16l/100km in the city and 12 on the highway...
And i do get a bit of decrease in fuel consumption, but nothing significant

ukrcan, i get the exact same kms/tank as you.