Something I'm considering is installing an aftermarket intake to help improve the uptake of oxygen and help curb some of the decreased performance and lost fuel efficiency.
I've got a 2017 Civc Hatch LX CVT and recently moved to Colorado. Altitude in my area is 5550 ft. Using a standard 3% loss per 1,000 feet, I'm estimating that I loose around 15% of my power.
My question is about fuel. In Colorado, "Regular" fuel is 85 Octane. Not to be confused with E85; 85...