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Old 08-27-2017, 06:17 PM   #6 (permalink)
BLSTIC
Master EcoModder
 
Join Date: Jun 2010
Location: Australia
Posts: 253

Delivery 'Boy - '86 Suzuki Mighty Boy
90 day: 37.15 mpg (US)

SkipSwift - '13 Suzuki Swift GL
90 day: 35.44 mpg (US)
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The oversquare bore sizing is purely about revving harder and bigger valves. Unfortunately it has a deleterious effect on fuel economy thanks to flame travel distance.

You'll note how pre-DI Subaru Flat 4's use much, much more fuel than their Mitsubishi counterparts despite being otherwise fundamentally similar cars
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