Quote:
Originally Posted by aerohead
I ran back-of-the-envelope numbers on the Tahoe.If,without hypermiling,you're currently experiencing 31.2-mpg @ 60-mph,in order to achieve 40-mpg,under identical conditions,would require a drag reduction to Cd 0.136,lower than the GM Sunraycer,solar race car of 1987.A 60% drag reduction (if we presume Sunraycer's current Cd is adjusted for a crosswind-averaged coefficient.
The 'baby' template model registered Cd 0.1201 @ zero-yaw with complete canoe fairings on all wheels.
There's no 'physics' boundary obstructing your achieving the new target,however the man-hours necessary for fabrication might blow your 'human-capital' budget all to ---l.
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40-48MPG(shown on the read out display) at 45mph steady speed assuming flat grade MPH at 1,000-1050RPM in v4 mode
the issue is it's very very hard to keep it in the EVT mode that is where the mileage is at. and that is my typical speed locally per the speed limit..
just a slight breeze kicks you out of the Eco zone(such as an oncoming car or truck)
that is why i think a few aero mods can KEEP in the in Eco zone
the on the route i take i get 42MPG on the down hill side and 22mpg on the uphill side.(same route both directions) that is how i was able to get the 31.2mpg
variable speeds upto 90mph (just on the downhill sides on the way back up the hill i noticed i was able to save much more gas then going 55 up the hills as the instant gauge would drop to about 9mpg to 13mpg at 55mph )
also i noticed by the time i crested the hill i was going 60mph anyways.. using a light amount of gas pressing to keep the mpg gauge steady at 24-25 instant gauge. to keep the momentum going ..