Pulley weight, wow that is some ocd in depth analysis in trying to get every ounce of power. If I ever get on a Cessna plane, I need you to make sure all my luggage is at the correct weight before takeoff.
In my opinion, I believe the nissan rogue has more than enough power for everyday driving. I pass cars many times from a standing stop and I have a light foot. Moreover, the cvt transmission makes it feel alot faster for me at least.
And I drive with a lot of heavy exterior accessories. Very good acceleration but I have ho-hum mpg's.
It felt like a glorified electric golf cart, almost like an electric car without the changing gears when I first experienced a cvt, so it feels faster to me than the usual automatics I drove when younger.
Anyway, these grocery mom mobiles are peppy enough for me.
Another suggestion is a tire for driving economy. My mpg`s went down dramatically when I got a SUV high performance tire. It definitely had a higher rolling resistance. I had like 27-30 mpg showing consistantly as my average on the dashboard display before all the accessories, but after my mods and tires, I get 16-17 mpg.
The best I got the display to show with a backdraft on a long trip was 41-43 mpg when I played a little challenge with myself as a game trying to get the highest mileage to show.
Another suggestion to remove weight I always thought of and had in the back of my mind for more mileage was to remove the temporary wheel in the back. Since some people never use it like myself.
In the over decade I owned my rogue, I never needed to use it because of a flat. Maybe even remove the lug wrench and tire jack to save even more weight.
Remove roof rails for more aerodynamics. Now that's ocd level savings.
Some rubber floor mats are heavier then the oem, so keep the Nissan's.
But the ultimate ocd weight savings in your rogue is the driver themselves, you can lose 5-10 pounds of weight through diet and exercise to get even less weight that your vehicle would need to carry. Lolz
Driving techniques helps a lot too.
Take highway, instead of backroads.
Drive like a hypermiler, or at least time your stops. I coast to stop lights and signs. I'm not impatience and need to drive to a stoplight and then slam on my brakes like other drivers.
On highway, stay in middle and if possible stay in formation behind other cars at normal safe distance to draft on one another like birds flying together which is more efficient than solo.
Car monitors or phone apps that show mileage feedback.