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Old 04-23-2012, 10:49 PM   #831
NorthernFocalPoint
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Pioneer gas or MacEwen?

After trying Costco gas 2 wks ago, I got pretty decent city MPG's on my first tank, but this week I'm getting horrible MPG's (about 3MPG worse)! So bad that I checked my tire pressure (I swapped the winter tires off last week) and sure enough they were all low (34-35PSI). But even after pumping them upto 39PSI, my MPG's are not as good as back in the fall when I got the car before changing over to winter tires. I suspect this batch of Costco 87 octane gas has definitely got the full 10% ethanol.

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I've discovered a a difference of 2l/100kms between two different gas station chains. The smaller one is giving me much better fuel economy. Same fuel grades selected.
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Old 04-23-2012, 10:51 PM   #832
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Would you say about 2% better? That's about the difference in circumference between the 15" and 17" tires. :)

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What rims came with your car? I've been thinking of getting lightweight aftermarket rims, but I don't know how much the 17" painted rims that came with my car weigh.
I got better gas mileage and had better acceleration when I was sporting my lighter 15" winter Steelies.

Sent from my SGH-I897 using FF Mobile
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Old 04-24-2012, 08:07 AM   #833
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u mad?
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Old 04-24-2012, 10:17 AM   #834
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Originally Posted by NorthernFocalPoint View Post
Would you say about 2% better? That's about the difference in circumference between the 15" and 17" tires. :)
Lighter wheels will usually give you better acceleration and braking in part because they're lighter but more so because they have a lower moment of inertia. A pound more at the rim of a wheel would have the effect of more like ten pounds elsewhere.

Running the bigger wheels (18") with wider tires (235+) increases the moment of inertia quite a bit and actually slows the car down in acceleration and braking. It will tend to improve cornering, but on a car that's pretty good on cornering to begin with and is modestly powered I don't think FOCUSing on wider tires makes much sense from a performance stanpoint.

Of course, most of the reason to go with the bigger wheels is an aesthetic one and not a performance one...


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Old 04-24-2012, 11:18 AM   #835
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Originally Posted by raptor1956 View Post
Running the bigger wheels (18") with wider tires (235+) increases the moment of inertia quite a bit and actually slows the car down in acceleration and braking. It will tend to improve cornering, but on a car that's pretty good on cornering to begin with and is modestly powered I don't think FOCUSing on wider tires makes much sense from a performance stanpoint.

Of course, most of the reason to go with the bigger wheels is an aesthetic one and not a performance one...
So true. I think about buying smaller rims like every other day... but the 18"s just look sooooo goooooood
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Old 04-24-2012, 11:52 AM   #836
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First tank of gas on my SEL hatchback (AT) was 21.5mpg -- calculated by hand, and it matched what the trip computer said.

100% city driving, stop and go traffic. Still, I'm not happy and I hope it improves with time. Just under 500 miles on the car now. I'm a moderate driver, I've done a couple of aggressive starts from green but mostly standard city driving.

Not impressed so far, but I'll be patient and hope that things will improve.
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Old 04-24-2012, 12:57 PM   #837
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So true. I think about buying smaller rims like every other day... but the 18"s just look sooooo goooooood
When I ordered my 2012 Ti (Sonic Blue) on 4/14 I had the Sport Handling Package with 18's, but I got to looking at the replacement cost for the 18x235 tires and it looks like they're a minimum of $75/tire more expensive AND the gas mileage is 1-3mpg less so I decided to change my order to get rid of the 18's. Instead I added the Voice Nav.

Between the higher price to replace the tires and worse gas mileage I figured the increase in cost over, say, 120,000 miles would be around $1700. The trade off for better cornering but lesser acceleration didn't add up for me.


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Old 04-24-2012, 01:01 PM   #838
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Originally Posted by ericrz View Post
First tank of gas on my SEL hatchback (AT) was 21.5mpg -- calculated by hand, and it matched what the trip computer said.

100% city driving, stop and go traffic. Still, I'm not happy and I hope it improves with time. Just under 500 miles on the car now. I'm a moderate driver, I've done a couple of aggressive starts from green but mostly standard city driving.

Not impressed so far, but I'll be patient and hope that things will improve.
If you have an SEL switch to select-shift and keep the revs under 2500. Also engine braking will give you more milage.

I have a mostly stop and go traffic route here and with that I'm averaging around 26-28 from that. I still have highway and when I do I can average 35-42 depending on how clear the road is. City driving kills mpg but there are ways to make it last more.
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Old 04-24-2012, 01:24 PM   #839
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You can create a HUGE difference in mileage in the city just based on your driving habits, as long as you're not -waiting- at lights for significant periods of time. (I qualified this with that last part because if you're stuck idling there's nothing you can do except turn off the engine.) If you drive around in San Francisco or NYC, you're probably screwed no matter what you drive or how you drive it.

The trick is to preserve momentum. Especially in city driving, DON'T hug the bumper of the car in front of you. Leave the biggest space in front of you that the guy behind you will accept without getting all road-ragey on you.

When you're coming up to a red light, slow down early. You want to be moving, and moving as fast as possible, when you reach the car in front of you.

In light city traffic (say, 1-5 cars stopped a red light), I can still eek 35 mpg out of my warmed up manual SE. This all centers around NOT racing to the red light. You want to limp along so you preserve as much momentum as you can and stay off the brakes as much as possible. Every time you touch the brake you're giving away momentum you paid for in gasoline.
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Old 04-24-2012, 01:24 PM   #840
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Quote:
Originally Posted by raptor1956 View Post
...they're a minimum of $75/tire more expensive AND the gas mileage is 1-3mpg less so I decided to change my order to get rid of the 18's. Instead I added the Voice Nav...The trade off for better cornering but lesser acceleration didn't add up for me.
And don't even get me started on the turning radius and no trunk space... I mean... how long am I really going to drive on my spare tire for? Ugh.
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