Your definition of efficient, I believe, deviates from most. You mean the best total package, most comfortable etc? Most effective purchase, perhaps?
Yes, I do mean a Model S is a best total package compared to a 3.
But I don't know how most people are defining efficient. When I say efficient, I mean exactly that. Model S simply is giving much closer to the suggested range than a Model 3 for me. Okay, hear me out:
I've had Model 3 performance and awd for two years with p3d as my main vehicle. I got a job in another city which is 235 miles away and I thought well I'd be cool because my car is supposed to give me 299 of total range (310 when I got it in 2018) so if I drive it like a sane person and coast along at speed limit I'd be okay. Nope! My M3 struggled so much every time I made the drive and I'd end up with 5-15 miles remaining with the car asking me to drive below 65 to reach my destination halfway through my trip which was frustrating. It struggled so much so that I even had 1 mile remaining one time last month and it was 78 degrees that day. Not to mention I got constant headaches due to road noise due to long drives in interstate highways in M3. I desperately needed more range but I also didn't want to lose the performance (stupid, I know!)
I am in Kentucky and temperatures have a crazy swing. My model 3 struggles so much in Temps below 60 but that's not the case with S.
Got a Model S performance on October 9th and have made the same trip 3 times by now. Each time I have reached my destination with over 100 miles remaining, not to mention it's now colder outside, it was 56 degrees in this trip and after driving 235 miles I still had 108 miles, 103 miles and 105 miles remaining respectively. According to Tesla's website the difference in range between P3D and a Model S performance is only 48 miles (for the older G battery that didn't get the range update) but as you can see it's not the case in my experience.
In my experience, model s is way more efficient than model 3 and I assure you I've been driving both cars exactly the same way. I've not had Model S nag me to slow down and drive below 60 miles on an interstate highway with 70 speed limit which was common for M3 to do during this trip.
In short, MODEL S is more "efficient" when it comes to offering a range closer to the rated range. I mean what other explanation is there? I doubt at this point anyone can convince me otherwise since it's my personal experience and the difference between the two cars is very significant. Model S is a better car overall.
Check out the pics as my proof and also I made the same 235 miles trip in Model S today in severe thunderstorm that lasted at least 80 miles and it rained heavily for rest of the trip. I reached my destination with 92 miles remaining. I know it's strange and it caught me by surprise but I'm a believer in S and it's not changing anytime soon.
People will come up all sorts of reasons to justify their purchases.