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In the United States and Canada, octane ratings are in AKI, commonly shown as "(R+M)/2". All states require gas pumps to be labeled with the correct octane level and nearly all states do regular testing to make sure gas stations are in compliance. A minimum 82 octane fuel is recommended for most vehicles produced since 1984.
Another type of octane rating, called Motor Octane Number (MON), is determined at 900 rpm engine speed instead of the 600 rpm for RON. [2] MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable ignition timing to further stress the fuel's knock resistance.
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.
The fuel-characteristics of a particular gasoline-blend, which will resist igniting too early are measured as the octane rating of the fuel blend. Gasoline blends with stable octane ratings are produced in several fuel-grades for various types of motors. A low octane rated fuel may cause engine knocking and reduced efficiency in reciprocating ...
The combined fleet fuel economy for new cars and trucks with a GVWR of 10,000 pounds (4,500 kg) or less was projected to average 35.5 miles per gallon (mpg) for the 2016 model year based on the newly-established targets and projected fleet mix.
The more versatile hatchback, meanwhile, returns an EPA combined rating of up to 35 mpg, while sedans with the base 2.0-liter engine net a combined fuel economy rating of 33 mpg. Base price ...
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General Motors, like Ford, has heavily invested in EVs while still leaning on its profitable lineup of gas-powered cars, SUVs and trucks, including popular models like the Chevrolet Silverado and ...