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In the context of Figure 4, the P50 cost is represented as âcâ dollars. The P50 estimate is one with equal chance of project overruns or underruns up till when the project scope can be finalised. The P90 value is an estimate of the project cost based on a 90% probability that the cost will not be exceeded.his arises as the P90 cost estimation was adopted at the early stage during project scoping. Had the P50 cost estimate been adopted, there would have been a deviation of $7 million between the actual ($69 million) and budgeted P50 figure ($62 million). The project would have been under-budgeted.
R90 is available at probably 3 or 4 gas stations here in the Tampa Bay area in Florida as well as the majority of the marinas. 90 octane unleaded with no ethanol. 87 octane with 10% ethanol is currently about $3.70ish/gallon here and I paid $4.29/gallon last weekend for the R90 at a station on land. The stations on land typically have a disclaimer that it is for recreational use only and that it is prohibited for highway use.