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Nearly All Gasoline in Maine Now E10, Without State Mandate

Current percentage use of E10 and projected use for 2010. Click to enlarge. Source: KinderMorgan

Nearly all gasoline now distributed in the state of Maine is now an E10 blend (10% ethanol), according to the state’s Department of Environmental Protection (DEP). The introduction of ethanol-blended gasoline in the market is not a state requirement, but resulted from a combination of state and federal regulations, state and federal tax incentives and current fuel market forces, DEP says.

As of August, 39 states provide incentives promoting ethanol production and use, according to the Pew Center on Global Climate Change. Twelve have also introduced their own Renewable Fuels Standard (RFS); of these, eight mandate E10 and one (Minnesota) has an E20 by 2013 requirement. Nationwide, however, the fuel industry is rapidly closing in on an almost universal use of E10, and should reach that within several years, given a combination of factors.

Forces that accelerated the move to E10 in Maine, according to the Maine DEP, include:

  • MtBE Ban. Methyl Tertiary Butyl Ether (MtBE) was added to conventional gasoline to enhance combustion and octane levels and to meet the federal Clean Air Act mandate requiring 2% oxygen in Reformulated Gasoline (RFG). The Maine Legislature banned MtBE as a gasoline additive in the state after 1 January 2007. With the MtBE ban in Maine and other states ethanol has been blended with gasoline in place of MtBE. However, Maine has no requirement to blend gasoline with any oxygenate such as ethanol. (Maine withdrew from the Reformulated Gasoline (RFG) program in 1999.)

    The US Energy Policy Act of 2005 (EPACT 2005) removed the federal Clean Air Act mandate requiring 2% oxygen in RFG as of 5 May 2006. MtBE was the refiners’ primary fuel oxygenate to comply with the RFG oxygen requirement. Although EPACT 2005 did not ban the use of MtBE, the elimination of the federal oxygenate requirement led to a rapid phase-out of MtBE and a significant increase in the use of ethanol. While RFG can be produced without oxygenates, the industry uses ethanol to provide performance (octane enhancement), help achieve the lower air toxics requirements of RFG, and to make up the lost volume from MtBE.

  • Maine provides tax incentives for the manufacturing and distributing of biofuels.

  • Refiners and distributors are choosing to blend gasoline with ethanol due to a federal tax incentive (VEETC, earlier post) which, in the case of E-10 is $0.051/gallon, which has created an industry incentive to use higher volumes of ethanol.

  • Energy Independence and Security Act 2007. The Renewable Fuel Standard in the Energy Independence and Security Act mandates an increase in the amount of renewable fuels nationally to 9 billion gallons to be blended in the fuel supply in 2008 increasing to 36 billion gallons in 2022. Maine itself has no renewable fuel standard requirement.

Phase separation in a fuel tank. Click to enlarge. Source: Cim-Tek

With the increasing prevalence of E10, retailers are being forced to take measures to adapt their pumps, tanks and daily maintenance procedures for ethanol blend use. One of the biggest issues they face is preventing water contamination of the tank, which will induce phase separation. As little as 18 gallons of water in a 6,000-gallon tank can induce phase separation.

Depending upon condition, between 40-80% of the ethanol will be drawn away from the gasoline by the water, forming two discrete layers in the tank. The top will be a gasoline that is lower in octane, and perhaps out of specification; the bottom will be a mixture of water and ethanol that will not burn.



Ah, those New Englanders are natural born leaders.

E10 = less mile per gallon at higher cost no thanks you can keep your change and I hope you dont move to Texas.

Nate H.

Lets take that one step further:

EPA = Less MPG with Higher Cost

Case-in-point: 2007 / 2010 Diesel Emission Requirements - 20% Drop in fuel economy due to DPF Regeneration - This yeilds 20% increase in Road Tax Revenues as well as Sales Tax revenues by state.

Don't blame the Ethanol. Blame the EPA.

2/3 of all gas stations in US sell E10 while 1,800 stations sell E85. It keeps increasing. No other go, we have to diversify into alternatives.


Thanks for introducing this ethanol-blended gasoline,it will reduce the Global Climate Change and it also has the benefit for the Refiners and distributors to reduce tax incentives......


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