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Old 01-25-2013, 12:18 PM   #671
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Originally Posted by cobie56 View Post
the link does not work... even when i go to marketplace's home page.... the vid shows up but won't play... tried it on both a pc and a mac... oh, well.
Odd, as I started watching it before posting. Several adds before the story, but it did work.

Fundamentally, the conclusion as I stated in my original post is that premuim in a car not designed for it is playing into the marketers hands. I drive a Lexus RX as well as our Focus and do use premium in it as recommended. Once filled with regular at a US gas station (the pump said premium), but the mileage dropped precipitously. Once I refilled with premium from another station, all was fine. So, for a car that needs it; great. But for those that don't, save your money.

Note there is an "expert" guy in thestory who swears by regular and runs it in his corvette. To each his own!
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Old 01-25-2013, 12:30 PM   #672
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I'd like to see this "performance" gain on a dyno with regular and premium fuel or some kind of test showing a real diff instead of butt dynos.
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Old 01-25-2013, 01:16 PM   #673
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RonMaiden,

Yeah, empirical tests would be the best. I wonder if Ford has any tests made public? I'm curious though as to why you are so skeptical given Ford's own statement and the known mechanisms for increasing performance especially in an engine with 12:1 compression.

I'm not saying your skepticism is unwarranted I'm just curious as to why you think/feel that way.
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Old 01-25-2013, 01:39 PM   #674
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Yeah it does seem worse when it's colder , you're right. It's 20 degrees F here right now.. probly much colder in Michigan >;P
winter gas.
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Old 01-25-2013, 01:54 PM   #675
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high octane fuels usually improve performance, but it's a matter of how much. a few HPs? i'll save my money because you won't notice a few hp difference.

also, premium costs 20-40 cents more per gallon, that's almost a $5 difference at most. if the mpg difference is negligible, you're wasting money. the mpg difference would have to be enough to reduce the cost per mile of driving to sell me on it.

it would have to be +3mpgs using 91 for it to cost less compared to 87.
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Old 01-25-2013, 02:11 PM   #676
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I notice MPG increase in using premium fuel. at 10c-20c more for 89/91 I think it's worth it for a few MPG more.
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Old 01-25-2013, 02:40 PM   #677
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Quote:
Originally Posted by RonMaiden View Post
I'd like to see this "performance" gain on a dyno with regular and premium fuel or some kind of test showing a real diff instead of butt dynos.
The factory dyno results for the engine are at 160 hp and 148 ft-lb of torque on 87 octane fuel in the U.S., however for Austrailia the same 2.0L GDI engine is dyno rated on 95 RON fuel (95 RON is about 90-91 AKI octane in the u.s.) is rated at 125 kW or 167 hp on the fuel we would know as either upper midrange, or premium (90-91 AKI).

Therefore the gain is theoretically about 7 hp at the crankshaft of the engine.
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Old 01-25-2013, 02:54 PM   #678
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Quote:
Originally Posted by thejordan View Post
winter gas.
??? I've never heard of winter gas or summer gas until now. Is there a way to tell what i'm pumping into my tank at the gas station? Or is it all winter gas in the winter?
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Old 01-25-2013, 03:05 PM   #679
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Quote:
Originally Posted by mishka View Post
??? I've never heard of winter gas or summer gas until now. Is there a way to tell what i'm pumping into my tank at the gas station? Or is it all winter gas in the winter?
It's seasonal, so now that we are in the winter time frame (after november usually) they blend in a fuel that vaporizes more readily to aid in cold engine starts, but the additives and the formulation of the gas is less energy dense, and less efficient than the fuel sold during the spring through the fall/ (aka the summer fuel blends).
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Old 01-25-2013, 03:12 PM   #680
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Quote:
Originally Posted by suss6052 View Post
It's seasonal, so now that we are in the winter time frame (after november usually) they blend in a fuel that vaporizes more readily to aid in cold engine starts, but the additives and the formulation of the gas is less energy dense, and less efficient than the fuel sold during the spring through the fall/ (aka the summer fuel blends).
Is there any way to get the normal (non-winter) gas? I rarely start driving on a cold engine.
On that note, it takes almost 5 minutes for the engine to warm up in this 25 degree weather. Is it better to drive it cold since i'm not getting any "mpg" while sitting there at 0 mph? Or should I warm it up like I have been doing? I thought that colder engine uses more gas.
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