Ugh! Had a big night tonight planned and the Ipace would have stole to show at a black tie event. However, I was late and it had to be towed... why??? because the 120 miles it said I would get on the way home turned into 45 miles. I dont know what happened, but I began eating battery like a 6 year old android. Its in the garage now on the charger. Jaguar has an appointment for next week. But here is my best guess
1. I gave the dealership a list of things to make sure they did based on the info from this forum
- they DID NOT deflate the tires to the proper PSI so I had to go back
- I dont believe they updated my software either, although I specifically asked to make sure it happened
The range estimate is the car's best guess based on your average rate of consumption over the latest recent drives. What exactly that involves is unknown to me - is it the last 3 trips, the last 24 hours of driving activity, the last 3 days of driving or a combination or something else? I don't know. However, I have found that it is actually very accurate if I am doing what I have typically done over the last couple days. So if I have been primarily making short trips around town for the last few days and continue that same driving pattern my average consumption stays consistent, therefore the estimated range is correct. However I better not expect that range if I now decide to take a trip on the highway as it will be nothing close to accurate and as you discovered will adjust down about 10 miles every couple miles.
What I have found more helpful than the car's estimated range is to calculate my range based on my current trips average consumption rate. You can see that in the Eco Data screen or in the trip meter or likely a few other areas depending on your screen configurations. In my experience, that average consumption rate is a great way to predict the range, provided your driving is relatively consistent on that trip. This is really helpful if you are in a situation in which you think you will be traveling close to the end of your battery and provides you a better opportunity to look for plan b's sooner than hoping the car's range estimate is good.
The Eco Data screen is also helpful in order to squeeze the extra miles from the car. Look at the Range Impact area to determine what accessories are sucking juice and then adjust/turn-off as desired. For instance you will notice ventilated seats have minimal impact, but the AC compressor is a big hog. The difference between Eco mode and low power mode is not huge. Note if you select low power mode it turns everything off, even the things that make close to zero difference like the radio and the center screens. You can turn those back on without exiting low power mode. You can even turn the HVAC fans back on (they have a small impact, but not much). Speed is a big killer, cruising at 70mph uses a lot more juice than cruising at 55mph. You can mitigate that difference by using the auto-follow feature and draft a semi
BTW - deflating the tires will have a negative impact on range, so if that is an important consideration, over-inflate, not under-inflate