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I totally agree. The US spec vehicles are way undergeared most of the time so that people are forced to drive 55-60 mph for maximum economy. My old Honda Accord spins at about 2500-2600 rpms at 55, but at 70 you are at 3000-3200 rpms.
Bruce Malinson over at Pittsburgh Power ( builds hot rodded Class 8 truck diesels ) has brick like Peterbilt 389s with 800+hp Cat C15s that average 8-9 mpg loaded running single over 18 spds with 2.64 gears in the axles. Most modern aero style trucks can't do that.
Reducing friction and increasing thermal efficiency is all it is.
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