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I was thinking that plugging the intakes off would basically negate any need to do the exhausts... since nothing would be flowing through anyway.
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The intake, compression and power strokes will happen with a vacuum, but towards the end of the power stroke, when the exhaust valve opens, gas would rush into the empty cylinder. The last upstroke, would then be done with pressure acting on the piston.
Cancelling one up and one down stroke with vacuum, leaves us with one down stroke with vacuum and one up stroke with pressure, netting a significant loss.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)