In the Seventies the US manufacturers (Ford, especially) applied a cheap and easy fix to many of their cars and trucks to raise fuel economy. You guessed it: higher final drive ratios. Just swap in higher gearing in the differentials, and Voila! Better EPA numbers, instantly. At the expense of acceleration, of course. Honda did it too, with the Nineties Civics. I drove one for a few years, and despite my Civic EX having almost 40 more HP than my '86 Civic Si, the little Si accelerated faster, and with its high OD also got better fuel economy. I really, really hated having to start off going uphill in the EX...
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.