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The average price of regular gasoline rose from $1.773 during the week of April 27, 2020, to $5 as of June 11, 2022, an all-time high. [37] California led the nation in gas prices with an average gallon of regular gas in the state reaching $6.43 as of June 11, 2022. [38]
The average cost of gas has decreased 15% in the last two years, from when it was $4.27 per gallon. The highest recorded average price of regular gas was in June 2022 at $5.06 per gallon.
Notes: (1) Based on 45% highway and 55% city driving. Electricity cost of US$0.13 /kWh, premium gasoline price of US$2.51 per gallon (used by the 2015 Volt, i3 REx, ELR, i8, Mercedes S500e, Karma and all Porsche models), and regular gasoline price of US$2.04 per gallon (as of 18 December 2015). Conversion 1 gallon of gasoline=33.7 kWh.
A gasoline engine burns a mix of gasoline and air, consisting of a range of about twelve to eighteen parts (by weight) of air to one part of fuel (by weight). A mixture with a 14.7:1 air/fuel ratio is stoichiometric, that is when burned, 100% of the fuel and the oxygen are consumed.
REC-90 is an ethanol-free, 90 octane unleaded gasoline blend designed for use in recreational/marine engines which can be damaged by the ethanol found in other gasoline blends. It is also usable in some aviation engines [ 1 ] and automotive engines, though it has not been thoroughly tested for cars and trucks.
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[97] The Associated Press said premium gas—which has a higher octane rating and costs more per gallon than regular unleaded—should be used only if the manufacturer says it is "required". [98] Cars with turbocharged engines and high compression ratios often specify premium gasoline because higher octane fuels reduce the incidence of "knock ...
The high value is obtained when, after the combustion, the water in the exhaust is in liquid form. For the low value, the exhaust has all the water in vapor form (steam). Since water vapor gives up heat energy when it changes from vapor to liquid, the liquid water value is larger since it includes the latent heat of vaporization of water. The ...