2021 P400 SE. I live in the Miami area, and generally, I'm either stop-and-go or part of what feels like a group high-speed chase. My daily trips are usually very short. Most days, it only sees about 3 - 10 miles of use with the occasional long road trip or drive out of town. It hit me yesterday I've driven it only 7k miles in a year. Since getting the GAP tool a few months ago, modifying things to my preference, and unlocking dynamic mode and adaptive cruise, I've been chasing the best gas mileage setup for my daily use habits. In short, it seemingly doesn't matter until you're measuring things at sustained highway speeds.

None of these are complaints; some are obvious to owners here, and any new car today has its electronic pros/cons. I do wish there were more info about the parameters JLR modified for each mode. Curious what others exprience across the 3 modes.

No matter the mode, across all measured "Journeys" in the past 6 months, it averages 15.6 mpg. AC always set at 70-72 (I'm OCD about it) or windows down/no fan. Auto stop/start also always disabled when I get in.

• Eco mode - Around town in regular traffic, this is useless and does nothing, even more so in stop-and-go for my use case. I understand the misinformation about Eco mode and how people feel it just displays tips. The manual states that some electronics parts are powered down to improve efficiency. When engaged, I can feel the AC blow slightly less intensely, and the throttle response slows down immesenly. I think the electronic supercharger takes a hit on that setting. Even when I mash on it, it doesn't seem to get the same power distribution that you get in Comfort. That said, I have achieved 25- 27 mpg at 75-80mph on long, sustained highway drives. I would expect engine braking to be used more in Eco, but I haven't felt that. My average 3 mi use in Eco, not exceeding 30-40mph: 9.6mpg
  
• Comfort Mode: Honestly, better than I expected for fuel efficiency for driving around town on short trips. Drives like a truck as expected, but the engine braking is what I notice aiding in MPG improvement. The same trips I'd logged above came in at 10.8mpg. Highway mileage is a hair under the Eco average. Zero battery/power issues on a day to day basis. Averages 18-20mpg sustained highway.
  
• Dynamic Mode: I've found this to be the most fuel-efficient mode around town, with two caveats. One, you're not intentionally driving the car hard. Two, you're not driving it in Dynamic + Sport mode. Dynamic mode on its own has the perfect amount of throttle response and engine braking. Same 3 mile trips averaged me 12mpg. If no traffic on the same route at night, it hits 22-24mpg. Dynamic mode for sustained highway cruising wasn't awful - just shy of 19mpg. My theory on the improved around-town dynamic driving MPG is that the light throttle response staves off my perceived "on/off" Comfort mode experience and I'm actually off the throttle less and with less pressure.
  
• Eco/Remote Start/Battery Drain: Running the car in Eco for my little 3 mile drives, after the second or third day, almost always led to PIVI requiring a couple of extra minutes to fully boot up (ex: digital display is black for a minute, map image takes a minute to load, detects carplay reconnection need, and then automatically connects a moment later.) I don't care what any retailer says, but the grille light bars also cause a little battery drain. Before removing the grille light, I often had the lower-power PIVI experience, no matter the driving habits. I usually use the remote app to cool the car down, and when I have to run into the store, I keep my dog inside. Unless this is preceded or followed by a sustained ~5min drive, I also get a slow PIVI startup. When I attach it to a device/charger, there's a slight measurable battery reduction, but again, it only takes an extra minute to power back up fully.
  
• Adaptive Cruise: This feels like a novelty and was probably the most disappointing feature unlock. I noticed the worst highway gas mileage when using adaptive cruise because the car constantly made slight throttle adjustments relative to the vehicle in front of me. Any time someone would change lanes in front of me, it'd slow down immensely, adjust, then speed back up. The experience as a driver and passenger isn't smooth. I have found myself only using this when the highway is completely empty, and mostly as a laziness setting along with lane monitoring enabled.

Like most modern cars, I noticed the ECU "learns" and picks up on my driving habits, but it doesn't hold them to memory for too long. If I spend a day hammering around in Dynamic, the next day, I see that it's noticeably more sporty in Comfort mode, and similarly if I keep up the habit. If the next day is spent in parking lot traffic, throttle response in Comfort is noticeably different/laggy in comparison. My C63 does this, but maintains the prior habit settings for more than what seems like 24 hours.

I know a lot of people have unlocked Dynamic across a variety of Defender models. Curious what others have experienced. My car is CPO and I'm thinking of picking up a Miltek exhaust and tune. I never sacrified much in gas mileage with my other cars after tuning them until I upgraded downpipes, which won't be happening.

Still working hard to get that 0% driving score one day!

 

We have a 2020 P400 SE and just received a GAP IID G4 to do some of the referenced unlocking of capabilities. While familiarizing myself with the tool, I found a section on the battery and see that I can get a reading for battery condition or health which is shown at 92%, which seems good. However, I have checked a couple of times to confirm, but state of charge has been in the low 40's ...typically 42%. Seems low but not that familiar with the PHEV overall operation.

Has anyone else noted similar readings and what they indicate?

 

Pretty similar 40-50% numbers here when I am just using it day to day.

 

Thanks, I saw the battery level via GAP and wondered if that could be real. The vehicle had been in for a couple of warranty issues two of months ago with no mention of any battery problems, but that was before ordering the GAP tool.