Take 50+ year old technology for best fuel economy- Hemisperical (or close to it) combustion chamber, dual spark plugs and dual spark source like 2 magnetoes, maybe direct fuel injection or leanable light throttle carberator. You can find examples in Pratt&Whitney 14 cylinder radials. BMW /5, /6 motorcycle engines had some dual plug upgrades when worried about unleaded gas here- claimed road mileage increased 5-10% under 90mph. Ford 140 inch 4 with dual ignition advertised about same mileage gain still with carb. Central spark plug, high energy ignition and port type fuel injection nowadays getting about the best compomise of fuel economy and performance. Cadillac has/had a 8stroke ignition cycle for light load running to get fuel economy and run cool- basicly fuel injector squirted only 1/2 the time. Lots of ways to get fuel economy known- but the marketable balance of power and performance may vary between Citroen 2CV and Ford Taurus when the 75 mile speed zones for 100 miles are considered. RN
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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