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Both matter, think backwards, you want the smallest engine geared for the highest load at the lower left quadrant of that bsfc window at 100 KPH.
You are looking for overall gearing to give you peak bsfc rpm, say 1800 in your 1 liter engine at 100kph-61.7 MPH. It could be a 4 speed (direct drive 4th) with a 1.7 to 1 diff ratio. You want gears close enough to provide adequate acceleration.
a 6 speed with redline speeds of 22, 44, 65, 100, 180 mph would be very good, and some form of super-turbo-charging for short term overburst power.
Like the Fiesta ecoboost but 700 pounds lighter with half the aero drag.
regards
mech
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