SgtGoldy

iTrader: (6)

Thank you for the conversion.

Sincerely,
USA

2013skyline

In Philly traffic (going from NE philly to center city) I usually get 17-18.5mpg these days. Although the 1st 3 months when I had the car when it was brand new I only got 15.5-16.5 mpg. On highway trips I get about 27-29mpg (long trip from philly to detroit).
My car is a 2013 g37xs sedan. For the power the car has and awd. the mileage isnt bad. I know 335xi and is350 awd might have a slight edge but our cars arent that bad. respectable mpg w/ great power.

Ampli

Worst here, i do 90% in city driving and it's 14-15 mpg (15-16 l/100km) i can't pass 425km in town with a full tank of premium gaz... (100$/week)

But as soon i'm on highway for 40km+ run, it's get back to 28-29 mpg (8-9 l/100km) !!

EDIT : beside that, I love my car lol

tchoke

at first i wasnt annoyed by the mpg but lately its been same 14l/100 at this pace i could have bought an suv lol

ross7778

I've had my 2012 G37x for a couple weeks. The car says an average of 16 mpg. My calculations say 11 mpg.

I put in 8.8 gallons and my trip meter said 100 miles.

11 mpg seems absurd. Hopefully I just forgot to reset the trip meter last time I filled up.

Even 16 mpg seems awful. I drive 70% city and 30% highway.

NoFear13

I have a 2013 G37x. My driving is 70% city, 30% highway. I have been averaging 22.5-23 MPG.

ross7778

I checked my tires this morning and they were all down 4psi. That probably wasn't helping my mpg.

allllaann

I do a lot of local driving and I'm averaging right around 20-21

Tim30250

I typically do about 50/50 city/hwy, sit in a fair amount of traffic on weekdays, and have consistently averaged 19.5-22.0 mpg per tank. If I do mostly highway I've seen as much as 27, but never above that. Kudos to those who are flirting with 30 mpg.. impressive.

andy_s31

Hey guys....I also live in toronto and in the summer i was getting about 630km on a full tank vs. now i am getting about 500km in the winter....is this normal? i also vary from 11.5L-13L per 100km....not sure if this is good or not...I am the #1 newbie when it comes to cars by the way..thanks

andy_s31

Hey bro. what do you normally get in the winter time? if you are lucky enough to have winter in your area. lol.

rpm&my_G35

Thats a pretty big change.
Did you put on winter tires and check they are properly inflated. A 21% drop is too much.

I go from my summer wheel&tire to the lighter OEM Sport wheel with winter tires and notice almost no difference.


9 reasons your winter fuel economy bites

1. More idling
This should be a no-brainer, yet parked idling cars are a common sight in cold weather. Resist the temptation to idle your car to warm it up. An idling engine gets 0 mpg. Consider also that idling the engine does nothing to warm up the tires and drivetrain.
Even in the coldest weather, you can begin driving after 30 seconds from a cold start - keep speeds low/moderate and use gentle acceleration until the temperature gauge starts to climb (source).

2. Low tire pressure
Of course you're smart enough to keep up your tire pressure as the temperature drops, right? A 10-degree (F) change in ambient temperature equates to a 1 psi change in tire pressure (source). Fuel economy declines 0.4 percent for every 1 psi drop (source).

3. Increased rolling resistance
Even if you're completely attentive to proper tire pressure, cold ambient temperatures will still cause your tires to return worse mileage. That's because a tire's shape isn't completely round - the sidewall bulges out at the bottom, and where the tread meets the road the small contact patch is actually flat. As the tire rotates, it constantly deforms to this shape, and this deformation requires more energy when the rubber is cold and hard. Rolling resistance at 0 degrees F is 20% greater than at 80 degrees (source 1, source 2).

4. Crappy road conditions
It's increased rolling resistance of another kind: driving through slush and snow. And then there's its wasteful polar (no pun intended) opposite: no friction at all! (A.K.A. wheelspin on ice.)

5. Lower average engine temperature
In the winter, an engine takes longer to reach operating temperature and cools off faster when shut off. Since the engine management system orders up a richer mixture when cold (proportionately more fuel in the air/fuel combination), more fuel is being burned overall.
A block heater can offset this problem (improving fuel economy by 10% in sub-zero conditions - source), as can garage parking, and combining trips (to minimize the number of cold/hot cycles).
Also related...

6. Higher average lubricant viscosity
Engine oil thickens as it cools. So does transmission and differential fluids and even bearing grease. Significantly more energy is needed to overcome the added drag these cold lubricants cause.

Using synthetic fluids can address this problem, since their viscosity changes less at extreme temperatures than traditional mineral fluids.

7. Weaker gasoline
Gasoline doesn't vaporize readily at very cold temperatures. So oil companies formulate fuel differently for cold-weather markets in the winter. Unfortunately, the changes that provide better cold vaporization characteristics also result in less available energy for combustion. You won't get as far on a liter of winter gas as you will on a liter of summer gas. (Source.)

8. Higher electrical loads
In colder temps, you use electrical accessories more often:
- lights (in higher lattitudes it's darker in the winter)
- rear window defroster (because it's easier than using the ice scraper, right?)
- heater blower motor (I don't have a/c, so this isn't balanced out during warm conditions); heated seats/mirrors
- windshield washer pump (because it's easier than using the ice scraper, right? And for frequently cleaning off dirty road spray.)

9. More aerodynamic drag
No, I'm not referring to the layer of snow you're too lazy to brush off the top of the car (though that would hurt mpg too).
A vehicle’s aerodynamic drag is proportional to air density, and the density increases as temperature drops. For every 10 degree F drop in temperature, aerodynamic drag increases by 2% (source).

9 reasons why your winter fuel economy bites! - MetroMPG.com

warped ideas

City 18.3 MPG Highway 26.7 MPG.... Then I put the Typhoons on and it has dropped a bit to 17.1 City, 25 Highway..... I need to get the car tuned I believe. Lauderdale has sick traffic this time a year though. Canadians are back for there 4 month "holiday". Stop and go traffic even on the highways....

warped ideas

Thanks for the article. I just put air in the tires this AM since last night was our first big drop in temp this year. 49 degrees F this AM. Low tire pressure light was on. Found my tires to all be around 27 psi. Had to take it back up a bit to 40 psi. When I had my rims and tires put on it was August and like 101 degrees F. It's a big difference from then.

rpm&my_G35

Silver/blue haired Canadians...slow overly cautious drivers.
Traffic improves up here for the same four months.