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Regular Gas Prices
Price Station Location Last Update
$3.27 9/10CostcoNuhou St.Nov. 06, 05:54 pm
$3.31 9/10Wailua ShellKuhio HighwayNov. 06, 06:22 pm
$3.32 9/10Hanama‘ulu ShellKuhio HighwayNov. 06, 05:51 pm
$3.33 9/10Old Cannery FuelsKapahi, Kawaihau RoadNov. 01, 05:51 pm
$3.34 9/10Hanapepe ShellKaumu‘ali‘i HIghwayOct. 13, 03:47 pm
$3.34 9/10Waimea ShellKaumu‘ali‘i HighwayOct. 13, 03:47 pm
$3.35 9/10Puhi ShellKaumu‘ali‘i HighwayNov. 06, 05:57 pm
$3.36 9/10Kalaheo 76Kaumu‘ali‘i HighwayNov. 06, 05:59 pm
$3.36 9/10Kalaheo ChevronKaumu‘ali‘i HighwayNov. 06, 05:56 pm
$3.36 9/10Kalaheo ShellKaumu‘ali‘i HighwayNov. 06, 05:55 pm
$3.39 9/10Kapa‘a ChevronKuhio HighwayNov. 06, 05:50 pm
$3.41 9/10Kapa‘a ShellKuhio HighwayNov. 07, 08:39 pm
$3.41 9/10Kilauea ShellKuhio HighwayNov. 07, 08:38 pm
$3.42 9/10Lihu‘e 76Kuhio HighwayNov. 06, 05:52 pm
$3.42 9/10Lihu‘e ChevronKuhio HighwayNov. 06, 05:52 pm
$3.42 9/10Lihu‘e ShellKuhio HighwayNov. 06, 05:53 pm
$3.42 9/10Rice Street ChevronRice StreetNov. 06, 05:53 pm
$3.42 9/10Kukui Grove 76corner of Kukui Grove and Haleko StreetsNov. 06, 05:54 pm
$3.42 9/10Koloa Chevroncorner of Po‘ipu and Koloa RoadsNov. 06, 05:58 pm
$3.66 9/10Princeville ChevronPrincevilleNov. 06, 05:48 pm
$Closed 9/10Waimea 76Kaumu‘ali‘i HighwayNov. 07, 08:39 pm

Diesel Prices
Price Station Location Last Update
$3.95 9/10Kalaheo ChevronKaumu‘ali‘i HighwayOct. 27, 08:43 pm
$3.98 9/10Old Cannery FuelsKapahi, Kawaihau RoadNov. 05, 07:59 am
$3.99 9/10Kapa‘a ChevronKuhio HighwayOct. 28, 09:59 pm
$4.05 9/10Lihu‘e 76Kuhio HighwayNov. 03, 12:48 pm
$4.05 9/10Kukui Grove 76corner of Kukui Grove and Haleko StreetsNov. 03, 12:47 pm
$4.24 9/10Princeville ChevronPrincevilleSep. 02, 07:58 pm

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Gas
Price
Station
PIN
Saturday, Nov. 7, 2009, 08:47 pm

price

The current model used for the Kauai Gas Price Projection in the above chart makes the following assumptions:
  • The price of gas can be predicted from the price of oil about 3 weeks earlier. This implies a constant time for oil to be processed into gas and get to the pump, and that the price of oil is the only factor affecting the price of gas.
  • The price of oil fluctuates much more than does the price of gas, so to smooth it out, the model uses a weighted average of the oil price from 1, 2, 3, 4, and 5 weeks earlier. The weights used emphasize the price 3 weeks ago, and progressively de-emphasize prices before and after that. (see details below)
  • The price of gas changes by 2.5 cents/gallon whenever oil changes by 1 $/barrel.
  • If oil were free, the other costs of getting gas to the pump would make the price $1.35/gallon.
These assumptions will change when enough history is collected to make a better model, but for now the formula used for the gas price prediction is:
  • GasPrice[today] = (OilPrice[1, 2, 3, 4, and 5 weeks ago] * $0.025) + $1.35
  • The "average price of oil" uses weights of 0.5, 1.0, 1.5, 1.0, and 0.5 for the prices 1 thru 5 weeks earlier respectively, so:
    OilPrice=(0.5*OP[1wag] + 1.0*OP[2wag] + 1.5*OP[3wag] + 1.0*OP[4wag] + 0.5*OP[5wag])/4.5
    where OP = OilPrice, and wag = "weeks ago"