Superchip
Registered User
Joined: Mar 2009
Posts: 42
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From: Daytona Beach, Fl
i finally was able to fix my rack and pinion so i used the mileage setting on my superchips to drive to tampa and back which is about 400 miles roundtrip, at about 70-75 i averaged throughout the trip 23.2 mpg, i was surprised because around town it dosnt make a difference
Champion
Joined: Mar 2008
Posts: 4,664
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From: University of Colorado-Boulder
we don't have it cuz of elevation
here is wikipedia's reasoning;
In the Rocky Mountain (high altitude) states, 85 octane is the minimum octane and 91 is the maximum octane available in fuel. The reason for this is that in higher-altitude areas, a typical combustion engine draws in less air per cycle due to the reduced density of the atmosphere. This directly translates to reduced absolute compression in the cylinder, therefore deterring knock. It is safe to fill up a car with a carburetor that normally takes 87 AKI fuel at sea level with 85 AKI fuel in the mountains, but at sea level the fuel may cause damage to the engine. A disadvantage to this strategy is that most turbocharged vehicles are unable to produce full power, even when using the "premium" 91 AKI fuel. In some east coast states, up to 94 AKI is available [1]. In parts of the Midwest (primarily Minnesota, Iowa, Illinois and Missouri) ethanol based E-85 fuel with 105 AKI is available [2]. Often, filling stations near US racing tracks will offer higher octane levels such as 100.
here is wikipedia's reasoning;
In the Rocky Mountain (high altitude) states, 85 octane is the minimum octane and 91 is the maximum octane available in fuel. The reason for this is that in higher-altitude areas, a typical combustion engine draws in less air per cycle due to the reduced density of the atmosphere. This directly translates to reduced absolute compression in the cylinder, therefore deterring knock. It is safe to fill up a car with a carburetor that normally takes 87 AKI fuel at sea level with 85 AKI fuel in the mountains, but at sea level the fuel may cause damage to the engine. A disadvantage to this strategy is that most turbocharged vehicles are unable to produce full power, even when using the "premium" 91 AKI fuel. In some east coast states, up to 94 AKI is available [1]. In parts of the Midwest (primarily Minnesota, Iowa, Illinois and Missouri) ethanol based E-85 fuel with 105 AKI is available [2]. Often, filling stations near US racing tracks will offer higher octane levels such as 100.
my friend is doing my rear bumper all the same color like the r/t's and ill prolly have him mix up a lil extra to eventually do the front
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Veteran
Joined: Nov 2007
Posts: 355
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From: Oklahoma
i finally was able to fix my rack and pinion so i used the mileage setting on my superchips to drive to tampa and back which is about 400 miles roundtrip, at about 70-75 i averaged throughout the trip 23.2 mpg, i was surprised because around town it dosnt make a difference
Registered User
Joined: Mar 2009
Posts: 42
Likes: 0
From: Daytona Beach, Fl
it depends, city i get terrible mileage around 15, and when i do drive highway its usually a long distance, using a full tank or 2, but like i said im not complaining about 23 mpg, but it doesnt make a difference in city, at least for me it doesnt
