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The engines are small in both physical dimensions and power output, relative to larger automobile engines.Power outputs are typically less than 11 kW (15 hp). The smallest of all are used in handheld garden machinery, such as string trimmers and chainsaws, which have a displacement as small as 24 cc (1.5 cu in). [2]
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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.
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.
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.
For example, Concorde cruised at 1354 mph, or 7.15 million feet per hour, with its engines giving an SFC of 1.195 lb/(lbf·h) (see below); this means the engines transferred 5.98 million foot pounds per pound of fuel (17.9 MJ/kg), equivalent to an SFC of 0.50 lb/(lbf·h) for a subsonic aircraft flying at 570 mph, which would be better than even ...
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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 ...