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[Mr.OmegaMan]

I've noticed recently (going by the trip computer) that my avarage MPG has gone down from 26-28mpg to around 20-23mpg, Going the same route roughly 27 miles each way, Nothing different in the driving patern apart from having the hid lights on and heated seat on.. I have reset the computer before setting off and before heading back... Do these really use that much or could it be the cold weather even or something else 

[MR MISTER]

I've noticed recently (going by the trip computer) that my avarage MPG has gone down from 26-28mpg to around 20-23mpg, Going the same route roughly 27 miles each way, Nothing different in the driving patern apart from having the hid lights on and heated seat on.. I have reset the computer before setting off and before heading back... Do these really use that much or could it be the cold weather even or something else 

Have you changed you air filter? 

[Mr.OmegaMan]

I've noticed recently (going by the trip computer) that my avarage MPG has gone down from 26-28mpg to around 20-23mpg, Going the same route roughly 27 miles each way, Nothing different in the driving patern apart from having the hid lights on and heated seat on.. I have reset the computer before setting off and before heading back... Do these really use that much or could it be the cold weather even or something else 

Have you changed you air filter? 

Yep, Had a service Mid June 2013 along with oil, spark plugs etc.. GM parts. It had a fuel filter just over a month ago.

[MR MISTER]

I've noticed recently (going by the trip computer) that my avarage MPG has gone down from 26-28mpg to around 20-23mpg, Going the same route roughly 27 miles each way, Nothing different in the driving patern apart from having the hid lights on and heated seat on.. I have reset the computer before setting off and before heading back... Do these really use that much or could it be the cold weather even or something else 

Have you changed you air filter? 

Yep, Had a service Mid June 2013 along with oil, spark plugs etc.. GM parts. It had a fuel filter just over a month ago.

That'll be it then. Read Opti's thread.

[Mr.OmegaMan]

I've noticed recently (going by the trip computer) that my avarage MPG has gone down from 26-28mpg to around 20-23mpg, Going the same route roughly 27 miles each way, Nothing different in the driving patern apart from having the hid lights on and heated seat on.. I have reset the computer before setting off and before heading back... Do these really use that much or could it be the cold weather even or something else 

Have you changed you air filter? 

Yep, Had a service Mid June 2013 along with oil, spark plugs etc.. GM parts. It had a fuel filter just over a month ago.

That'll be it then. Read Opti's thread.

So I need a dirty air filter 

In all fairness it's been fine on MPG till the clocks went back and it started to get cold. Even hit 31mpg at one point. That's if the trip computer can be trusted.

[PAULCDX]

Could it be down the fact the car is working harder with heating on, lights on, engine colder etc ? 

Just a guess but what do I know?   

[MR MISTER]

Could it be down the fact the car is working harder with heating on, lights on, engine colder etc ? 

Just a guess but what do I know?   

More than most on here by the sound of things, Paul

[martin42]

What is running temperature like? Normal or way below?

[tunnie]

You'd be surprised what cold weather, heated seats ect can do to fuel economy

[05omegav6]

Even with a new thermostat, mine is barely doing 23mpg

[Mr.OmegaMan]

Must be the cold dark weather then, Running temperature is around 85c/90c.

[Sir Tigger KC]

In all fairness it's been fine on MPG till the clocks went back....

Don't worry about it, as it'll be fine in a few weeks when the clocks go forward again! 

[blackviper90210]

I'm averaging 25.8mpg according the computer. Not bad considering how I drive 

[2boxerdogs]

My 2.6 has always returned 30mpg on my daily commute , however for the first time  last week I have started using the heated  seat & also changed the air filter in June.. My consumption is now 28mpg, so must be the combination of both.

[Dan282]

It doesn't take much for it to drop or increase. Mines current on 29.4 mpg but I've done about 5 miles in the last month