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  1. To assess octane costs, this study examines trends at the national, the Petroleum Administration for Defense District (PADD), and the regional wholesale market levels. The market for motor gasoline is global, and the U.S. gasoline market is interconnected with the global gasoline market through imports and exports.

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  2. In refining, marginal costs typically drive market prices • Catalytic Reforming units are the primary controllable octane source in the refinery • Refiners can optimize unit throughput and severity (octane of product) • Higher octane results in higher costs • Reformers convert naphtha feedstock into highoctane, high- -aromatics

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  3. Octane costs and values are often described in terms of dollars per octane-barrel ($/AKI-b).21 To measure the cost of producing incremental octane, we calculate the cost of producing an incremental barrel of premium gasoline (CTP) by raising reformer severity (Figure 29, red and black lines).

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  4. We present a model that predicts the research and motor octane numbers of a wide variety of gasoline process streams and their blends including oxygenates based on detailed composition. The octane number is correlated to a total of 57 hydrocarbon lumps measured by gas chromatography.

  5. We can model the heating values by using standard heats of combustion 1 for iso-octane and cetane. Engineers distinguish between higher heating value (HHV) 1 and lower heating value (LHV) 1 of a fuel.

  6. Travelmath provides an online driving cost calculator to help you determine how much you'll spend on gas for your next road trip. You can enter airports, cities, states, countries, or zip codes to compute the cost of driving between locations.

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  8. An octane number beyond 100 can only be obtained by an extrapolated octane rating curve or utilizing octane enhancers such as tetra-ethyl lead with the iso-octane reference fuel [14].

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