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Old 02-13-2006, 09:45 PM   #1
jigga
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Default Questions regarding winter fuel....

I have done a search for this but could not find the solution to my problem.
Thought my questions were more related to the tuning aspect of things, but if not, MOD's please accept my appologies.


Now, I know that with winter gas, the additives that are added to the gas to aid winter startup and all that good stuff tend to reduce the amount of energy that each molecule of gas supplies.... Is this correct?

I notice the worse gas milage also during the winter, and although it is partly because of the amount of time we spend idling the cars to warm them up, is another reason for the gas milage because the car runs leaner during winter, so the ecu needs to dump in more fuel during each combustion stroke to compensate? Or is this more because of the makeup of the winterfuel?

During winter, is 94 octane gas is really 94 octane gas, and more like 92 or the like?

Finally, does the nature of winter fuel mean that it might not be a good idea to get a good dyno tune for optimum power with it in the tank? Or is one better off waiting for the summer blend to kick back in?

Thanks guys.
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Old 02-14-2006, 12:16 PM   #2
jigga
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c'mon guys... someone must know
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Old 02-14-2006, 12:58 PM   #3
Vampyr
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Your biggest gains with the different fuels are mileage... not necessarily power.
Winter Blend gas is something that oil companies refuse to discuss. I believe the truth behind it is that Oil companies do not make as big a profit in the winter due to less driving, and therfore the refineries mix the gas to drop the mileage in vehicles so that they have to buy more gas more often.

If you are going to dyno and tune the car... it may actually be better to do it on Winter gas... because then when summer comes around, your car should have a little extra kick to it based on the summer blend.

Honestly though... it's best to get a dyno & tune with the gas you always use.... otherwise, if something forced you to use an octane lower than what you were tuned for... your car will run like crap.
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Old 02-14-2006, 04:22 PM   #4
jigga
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Thanks for the response! I use 94 octane gas all year round in my car, but as mentioned, was not sure if winter 94 octane gas was not actually a 94 octane gas, but something lesser... I guess I was thinking somehow that part of the reason why milage was worse during winter had to to with the octane rating of the gas as well as the increased fuel that would be used by the engine to prevent from running too lean in the cold weather.
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