Surprised at Gasahol Result
Research Octane is always higher. Motor Octane comes from a diffent test. The average is what they post on the pump in the USA. This average is also called AKI, Anti-knock index.
Yes pump gas has a range of variables although there are some regulatory requirements and industry standards. I had some Tier EEE high/low specs from one of those reports but didn't graph it. Av Gas is requirements are pretty tightly specified so less variablility there.
One reason for using race fuel is to eliminate the variability when serious about winning. Race gas is expected to be consistant. You can go to VP Racing, Sunoco Race Fuels or any other brand and find all the specs relevant for engine building and tuning; Specific Gravity, Oxygenation, RVP, along with the distillation curve points. Which one will provide the most power depends on the engine and is a subject beyond my knowledge. Perusing speedtalk and racingfuelsystems forums (and probably YB) will turn up posts that will give you a better idea than I could.
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Here's the graph with just pump fuels. The Tier 2 EEE high and low specs are added here. I only plotted 4-5 distillation points so the curves are approximate. Notice how the older Premium fuel didn't evaporate as much at ambient temperatures as the future looking fuels A,L and Tier 2 EEE. Interesting, huh?
Octane Ratings - Motor, AKI, Research
07? Prem 88.5 91.8
Fuel A: 84.0 88.0 92.0
Fuel L: 85.2 89.9 94.5
Tier 2: 88.0 92.3 96.6
Sources: ACE Optimal Blend Study 2007, Durbin et al CRC-E67
Research Octane is always higher. Motor Octane comes from a diffent test. The average is what they post on the pump in the USA. This average is also called AKI, Anti-knock index.
Yes pump gas has a range of variables although there are some regulatory requirements and industry standards. I had some Tier EEE high/low specs from one of those reports but didn't graph it. Av Gas is requirements are pretty tightly specified so less variablility there.
One reason for using race fuel is to eliminate the variability when serious about winning. Race gas is expected to be consistant. You can go to VP Racing, Sunoco Race Fuels or any other brand and find all the specs relevant for engine building and tuning; Specific Gravity, Oxygenation, RVP, along with the distillation curve points. Which one will provide the most power depends on the engine and is a subject beyond my knowledge. Perusing speedtalk and racingfuelsystems forums (and probably YB) will turn up posts that will give you a better idea than I could.
------------------------------------
edit starts here
------------------------------------
Here's the graph with just pump fuels. The Tier 2 EEE high and low specs are added here. I only plotted 4-5 distillation points so the curves are approximate. Notice how the older Premium fuel didn't evaporate as much at ambient temperatures as the future looking fuels A,L and Tier 2 EEE. Interesting, huh?
Octane Ratings - Motor, AKI, Research
07? Prem 88.5 91.8
Fuel A: 84.0 88.0 92.0
Fuel L: 85.2 89.9 94.5
Tier 2: 88.0 92.3 96.6
Sources: ACE Optimal Blend Study 2007, Durbin et al CRC-E67
