I wanted to post this because I’ve been driving my 2015 Civic since it was new, and I always just assumed "S" (Sport) was basically a "waste gas" mode or something you’d only use if you were trying to race someone.
I was totally wrong.
After 8 years of leaving it in "D" 100% of the time, I started playing around with shifting into "S" for highway merges and hills, and it’s a game-changer.
The "Eco" trap: I realized that in "D," the car is so desperate to save gas that it keeps the gears way too high. The engine ends up "lugging" and struggling to gain speed, which actually uses more fuel because you have to floor it just to move.
The Hack: Now, I pop it into S to get up to speed or merge. The car feels way lighter and actually gets to the target speed faster. Once I’m cruising, I drop it back into D.
Cleaning it out: My Civic feels smoother than it has in years. I think always driving it "slow" in D let a bunch of gunk build up in the engine. Letting the RPMs climb a bit in Sport mode basically gave the car an "Italian Tune-up," blowing out all that old carbon.
MPG: My gas mileage has actually gone up. I think it's because the engine isn't working as hard to overcome its own weight at low RPMs.
If your Civic feels a little sluggish or "heavy," stop leaving it in Drive all day. Use Sport to get moving, and you'll feel that "connected" Honda feeling again. I feel like I just got a new car after 8 years.
Quick Tips for the comments:
"Is it bad for the engine?" Nope. These engines are designed to rev. Keeping it at low RPMs and making it struggle is actually harder on the parts.
"When do you switch?" I shift from D to S while moving all the time. No need to stop. It’s like having a manual without the clutch.
*Gemini assisted, my thoughts.