With the exception of December, during the months of 2018, compressed natural gas (CNG) consumption for vehicle use was far above the five–year range (2013–2017), five–year (2013–2017) average, and last year's consumption. This is seen in Figure 1.
As shown in the data table below, the amount of compressed natural gas (CNG) consumed as vehicle fuel had been relatively stable from month to month during 2006 to mid-2011 with a bit of volatility thrown in in the summer and fall months. During August and September of 2011, CNG experienced a spike in consumption and then consumption skyrocketed in November and December. This increase in consumption was due to the drop in natural gas prices. Significantly lower natural gas prices continued from 2012 to the present. See Henry Hub data for spot price information. Annual consumption figures continue to increase significantly. The most recent increase, from 2017 to 2018, was 47 percent.
The number of vehicles consuming compressed natural gas can be found in the report The Number of Registered Vehicles in Nebraska by the Fuel Consumed.