vtune

Hi everyone,


what kind of fuel economy are you getting in the winter

Nanook

I would start by checking the air filter and tire pressure..

vtune

Thanks

jrcart

Might be a stupid question but did you check for a fuel tank and fuel line for a leak? That is terrible mileage even if you were beating the snot out of it you should get better mpg than that. My fuel mileage goes down when the temp drops (air density) but nothing like what you ate explaining.

charliekay

It is hard to say what the problem could be but a couple of questions that I think that may help are:

1. Is the check engine light on? Maybe get the car scanned for errors.
2. Do you regularly use the aircon?
3. Do you sit in traffic alot?

If the answer to all these is no then there might be a problem with an 02 sensor, spark plugs etc..

I get 300-350km, sometimes more out of a tank but I don't do alot of city driving. I have done trips where I set cruise control for 150+ kms and get 10.5-11L/100km. This morning I took the C for a drive and got stuck in traffic, and the car averaged just over 20L / 100km because I was in traffic.

Hope this helps a little.

Merc63

Idling to warm car will kill mileage and driving in the cold short trips as well.

I get about 300 in the city or 200 when I drive in manual mode with lots of downshifts.

Nanook

And your tune (if you have one) may need some tweaking

vtune

Thanks for all the help.
There is no tune - it is all stock.

Nanook

One last suggestion...plugged cats

abcut973

I did 460ish kms on my last tank (288mls). I drive the car daily (26mls) mainly highway in C mode unless i decide to do some spirited driving usually on friday ! lol !
But yeah i noticed idling, city traffic kill the mpg quickly. Having a vacuum leak will reduce it as well.

abcut973

Reset your on board computer and see if your average reads the same. As mentioned previously city driving kills the mpg badly. What part of the world are you?

vtune

I am in Toronto Canada.. It's been around -20C this week.

I did reset at full tank, end of tank was 27L, I also check the after start read out and it is slightly less, 22-23L/100KM

Most of my drive has been in the city with a bit of highway, not much traffic. I will try to see how it does on a highway stretch.

mercedes4ever

You would get better running 98 octane. When was the last time the spark plugs were changed?

CPD SLK

Can you take it back to who you bought if from? Where'd the car come from?

aussie e55

i use 17 litres of shell ultra 98 oct. per 100 Kilm. suburan driving with air con. on

Jasonoff

Try Shell or Esso 91. The Petro 94 is loaded with ethanol.

Quadcammer

also keep in mind that oxygenated fuel delivers worse fuel economy, but that shouldn't have this kind of impact.

aussie e55

i understand usa 94 octane is the same as aussie 98 octane is this correct ?.

crazy1eye

Yes, I believe 98RON = 93M+R/2

Roswell

That's news to me, I always thought Ultra 94 has very little % of ethanol.

crazy1eye

It can have up to 10% ethanol according to Petro-Canada

Roswell

Is this bad? I've been using Ultra 94 religiously since the day I bought my car cuz this is the highest octane we can get in Canada. LOL

Mort

With 94 octane you potentially get a little more performance and with the alcohol lose a little gas mileage. Fair trade off? Depends on how well the 94 burns in our cars and if it reduces knock vs 91 Shell then you will get a slight performance improvement. Not sure what performance you will get in reality.

Our cars can use fuel with up to 10% ethanol so you should be fine using Ultra 94 with no harm to your engine or fuel delivery system.

561design

This would be my first suspect. Also, your tire pressure can affect your mileage as well. A combination of the current temps, bad plugs and low PSI could contribute to you're low numbers.

Jasonoff

Yeah it does. Refineries here suck. They need it just to get the octane rating.

http://retail.petro-canada.ca/en/ind...ee%20gasoline?

Checkout this site
http://pure-gas.org/index.jsp?stateprov=ON