I have the same tire & wheels, and am in Comfort mode 95% of the time. Never tried eco mode.

 

A 235-mile road that I make regularly, 1/3 on interstate and 2/3s on state roads, running 80 mph on the interstate and 70 on state roads in ECO, I average 26 mpg. Around town in Comfort mode, it fluctuates between 20-22 mpg. 2025 RR SE P530.

 

Update: I failed to state that this ids work 23” wheels, A-C on and SWB.

 

Just out of curiosity, what tire pressure do folks prefer? Does it seem to matter with regard to mpg?

 

I'm running the sticker - 44psi front, 50 psi rear

 

OK, Same here.

 

Well, I tried the 50# route and found the ride rough, compared to the 33# setting. I don’t see any advantage to the higher pressure other than possibly better mpg, which may not be measurable. Besides, if someone can afford a $160,000 USD vehicle, who cares?

 

Cool. AgAir. We all have our individual preferences.
I'm curious, what part of Georgia? We'll be staying on St Simon's Island this spring.

 

Cool. AgAir. We all have our individual preferences.
I'm curious, what part of Georgia? We'll be staying on St Simon's Island this spring.

Perry, GA- Center of the state, ab 200 miles from St. Simons. If you have never been there, I’m confident you will like it.

 

17.5 MPG mostly city driving at this point -- car has 750 miles on it

 

Just keep in mind you can't outdo physics. The square footage of the part of the RR that directly opposes the air at high speed is exponential. So for every MPH you go above a safe/slow/low drag speed like 50mph, you're burning a lot more gas.

It's one reason I've always had sedans, but at this point I have health issues so it's time for a SUV.

 

by the way -- Im getting the same gas mileage on a 2025 D90 with the inline 6

 

We just got home from summer in Montana in our new p530. Started at 163 miles on the truck. Added 3600 miles. 25.4 mpg, 64 mph. Obviously, lots of highway time but I'm satisfied. Not a squeek, rattle, or warning light.