Factors considered included proximity to fuel stations, number of alternative fuels vehicles, gasoline prices, state level programs and incentives, proximity to fuel resources (e.g. The warming system, called Flex Start, was developed by Robert Bosch GmbH. Rocket listed the octane rating for their E85 as 112, but E85 from the pump can vary greatly. [152][153], The higher fuel efficiency of E100 (compared to methanol) in high performance race cars resulted in Indianapolis 500 races in 2007 and 2008 being run on 100% fuel-grade ethanol. [84] Due to this mandatory minimum gasoline blend, pure gasoline (E0) is no longer sold in Brazil. Based on the Japanese/German results, a minimum of 2 vol.% or 2.52% m/m water is currently proposed in the revision of the hydrous ethanol specification for blending in petrol at E10+ levels. I know this thread is old, but the OP chart is really helpful. This mixture has an octane rating of 108, however, the Ethanol molecule also carries with it an oxygen atom, where-as gasoline does not, effectively requiring the internal combustion engine to ingest less air per unit-volume by its own accord, which reduces pumping losses, and further increases the exo-thermic chemical reaction. [2][122][123] A total of 127 ED95 buses operated in Stockholm, five buses operated in Madrid, three in La Spezia, and one in Brazil. Moving forward, as car manufacturers increase the number of models equipped with high compression engines to maximize performance and efficiency, higher octane fuels will be required and ethanol is set to play a crucial role. I was also reading that in order to go over 50% e85 I would have to get an lpfp upgrade. VTT performed the comparison test under controlled laboratory conditions and their measurements showed the cars tested used an average of 10.30 liters (2.27 imp gal; 2.72 U.S. gal) of 95E10 per 100 km (62 mi), as opposed to 10.23 liters (2.25 imp gal; 2.70 U.S. gal) of 98E5 per 100 km (62 mi). The higher the octane number, the more resistant the gasoline mixture is to knock. Thanks for posting this chart Steve, very useful! [104] A further reduction in the ethanol content is used during the winter in regions where temperatures fall below 0 °C (32 °F)[105] and this blend is called Winter E85, as the fuel is still sold under the E85 label. [82][87] As prices rose abruptly again due to supply shortages that took place again between the 2010 and 2011 harvest seasons, some ethanol had to be imported from the United States, and in April 2011, the government reduced the minimum mandatory blend to 18%, leaving the mandatory blend range between E18 and E25. Today, the octane boost to prevent knocks is provided by gasoline aromatics, which comprise more than 25 percent by volume of each gallon of gasoline. Another way to prevent getting this page in the future is to use Privacy Pass. The EPA also decided not to grant any waiver for E15 use in any motorcycles, heavy-duty vehicles, or nonroad engines because current testing data do not support such a waiver. Octane Fig. Once started, the engine is then switched back to ethanol. Successful tests have been conducted to determine the performance under E20 by current vehicles and fuel dispensing equipment designed for E10. roads. [121], Under the auspices of the BioEthanol for Sustainable Transport project, more than 138 bioethanol ED95 buses were part of demonstration trial at four cities, three in Europe, and one in Brazil, between 2006 and 2009. [64] As of June 2013[update], there are about 24 fueling stations selling E15 out of 180,000 stations across the U.S.[65], In December 2010, several groups, including the Alliance of Automobile Manufacturers, the American Petroleum Institute, the Association of International Automobile Manufacturers, the National Marine Manufacturers Association, the Outdoor Power Equipment Institute, and the Grocery Manufacturers Association, filed suit against the EPA in the United States Court of Appeals for the District of Columbia Circuit. The retail fuel market is evolving. For (R+M)/2 octane rating, E50 and E85 are almost identical. criteria can be met • Posted octane considered a minimum. However, all three classes of fuel may be marketed as E85 … Testing a blend of E17 in new and used Underwriters Laboratory refueling equipment, NREL found 56 percent of the tested equipment was compatible. But its pump octane rating is 105, considerably higher than premium pump gas (93 to 94 octane) and comparable to racing fuels. Actual blend is subject to ethanol availability. Straight hydrous ethanol as an automotive fuel has been widely used in Brazil since the late 1970s for neat ethanol vehicles[84][131] and more recently for flexible-fuel vehicles. One such was MTBE which was eventually banned due to its toxic content. I don't understand the difference between true E30 (yellow lines) and mix E30 (white lines), can someone explain? Class 2 or E75 is 75 to 79 percent ethanol, while Class 3 or E70 is 70 to 74 percent ethanol. Blends of E10 or less are used in more than 20 countries around the world, led by the United States, where ethanol represented 10% of the U.S. gasoline fuel supply in 2011. In the United States, the majority of ethanol is used as part of the standard E10 blend. [108] Thereafter, and as a response to the 1973 and 1979 energy crises, the first modern vehicle capable of running with pure hydrous ethanol (E100) was launched in the Brazilian market, the Fiat 147,[141] after testing with several prototypes developed by the Brazilian subsidiaries of Fiat, Volkswagen, General Motors and Ford. Low-ethanol blends, from E5 to E25, although internationally the most common use of the term refers to the E10 blend. Découvrez comment nous utilisons vos informations dans notre Politique relative à la vie privée et notre Politique relative aux cookies. In addition to dedicated vehicles that can use higher ethanol blends, EPA and DOE have certified the use of E15 (15 percent ethanol) in cars of make and model year 2001 and newer—that is, more than 80 percent of cars on the road today. [5], E10 and other blends of ethanol are considered to be useful in decreasing U.S. dependence on foreign oil, and can reduce carbon monoxide (CO) emissions by 20 to 30% under the right conditions. Optima’s goal is to reduce per-vehicle petroleum consumption by 30 percent by 2030 using a combination of improved fuels, growth of the bio-economy, and alternative vehicle technologies. You would have to test the exact octane rating, I think it's not possible at all to calculate it. Currently, high-octane fuel is marketed as ‘premium,’ but future combustion engines may require higher octane fuels to reach even greater engine efficiencies and higher mile-per-gallon ratings. Japanese and German scientific evidence revealed the water is an inhibitor for corrosion by ethanol. Mixed tanking scenarios with anhydrous ethanol blends at 5% or 10% level do not induce phase separation. 15 Sep. Posted by: Category: Uncategorized . Some like to say ethanol is less efficient, and that is incorrect. [102][103], In the US, this seasonal reduction of the ethanol content to E70 applies only in cold regions, where temperatures fall below 32 °F (0 °C) during the winter. The aluminum alcoholate/alkoxide does not make a tight oxide layer, which is why the corrosion continues. [86] However, as a result of a supply shortage and the resulting high ethanol fuel prices, in 2010, the government mandated a temporary 90-day blend reduction from E25 to E20 beginning February 1, 2010.

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