You did what!

I'm a bit confused. I'm not exactly sure what a GLE 400 is. I know at one time (2015 or 2016?) there was a GLE 400 which had an 8-cylinder engine. Next, possibly in 2016, there was a GLE 400 with a 6-cylinder engine. Next, the GLE 400 was no longer available and became the GLE AMG 43 with a 6-cylinder bi-turbo engine at 365 or so HP, which in 2018 was also a 6-cylinger bi-turbo engine developing 385 HP. I'm assuming the same engine as previous, and different chip, or differently tuned chip. I actually just purchased this one (GLE AMG 43 SUV - not the coupe). So, can you someone please explain now what is a GLE 400?

As an interesting little tidbit, at about 450 miles, non-highway driving, I'm at 12 or so MPG. I'm assuming it will improve once i get over 1K miles.

I didn't know any 400's to have a V8. They have always been V6s. My 2016 GLE400 has a twin turbo V6 3.0L. It was also very shortly lived on a few 2017 before it went to a GLE43 in which Mercedes kept the same engine but just tweaked it and turned the turbos up a little. There were no 2015 GLE's because it was the ML prior to 2016 when MB did the facelift and I don't know if the 400 was offered on the ML ever. This is all relevent to the USA and maybe a little diffrent in other countries.
On a side note, and to confuse you little more, there was a GLE450 coupe for 2016 and again very short 2017 before it went to the GLE43 coupe too.
(please excuse any typos or information as I'm sitting in a hospital bed recovering from back surgery with great pain drip IV )

Twin Turbo V6

If you go back to the beginning of the W166 in the 2012 model year, there was the ML350 V6 gas engine, ML350 Bluetec V6 diesel engine, the ML550 V8 gas engine, as well as the AMG ML63. For 2015, the ML550 V8 became the ML400 V6. With the facelift for the 2016 model year, the lower V6 gas continued on as the GLE350 and the higher V6 continued as the GLE400. Also, the V6 diesel was dropped and they introduced a 4 cylinder diesel GLE250 which is no longer available due to the VW mess. Then for 2017, the GLE400 was dropped and the GLE43 came about (329hp vs 362hp). This was all for the US market.

I think what may be going on is that the GLE 400 is not a US model and it does have a Bi-turbo V6 engine, but I'm not sure which Bi-turbo V6 it is.

Also, to follow the chronology above, in 2018, the 362 HP engine became the current AMG 43 385 HP engine in the US market.

The GLE400 was available here in the US for a short time before it was replaced by the GLE43. The "43" engine is the one that was used initially in the C450 then rebadged as the C43. Next year, they'll all be replaced by the "53" I6 models.

I was curious as to what the Canadian V6 maybe as engine size and I came across this build page on Mercedes Canada. Is this correct? Does Canada get all these different choices? I want that 550. The heck with that noisey bee buzzing sound of the fake AMG 43's!

Yes. The GLE 550 is a V8. But now I’m excited about the new GLE53 that maybe coming!

What engine will be in that model?

Excuse me. "Fake AMG 43's"? "Bee-buzzing sound"? Actually mine seems to roar and nothing fake about it - seems to move. Possibly Canadian air changes the sound I guess.

I'm not 100% sure what the "53" engine is but I think it is a 3.0L twin turbo with some kind of electric motor too.

I was waiting for someone to take offense to that. A friend of mine also has a C43. It's the "AMG" GLE43 naming that creates the fake AMG image in people's minds. The real AMG GLE63, or any of the other "63" models have high performance hand built engines. The 43 engine is not. In the case of the C-class, what used to be the C450 was just rebadged as the C43, same exact engine. And that engine is now in many of the vehicles in Mercedes' lineup. Almost similar to BMW's M-performance vehicles (M550xi, M760li, X3M40i, etc) which have tuned engines, upgraded suspensions, performance exhaust, etc but are not full M cars (M3, M5, X5M, w/ what are essentially racing engines). BMW's naming leads to a bit more of a distinction and less mis-belief than Mercedes doess. An M550xi is not an M5 just as an AMG E43 is not an AMG E63. In fact, Audi has been on this trend for years with their S-line cars vs the RS vehicles.

The 53 will be replacing the 43 engine next year. It will be an inline 6 cylinder turbo w/ 429hp. It will also have a 21hp electric motor and a 48V electric system. I think it will be in the CLS first, then the E-class, and eventually in the rest of the cars.

Sorry, nothing "fake" about it in my mind. The car roars - not "buzzes", I enjoy driving it, the floor mats say "AMG", it has the AMG checkerboard on the gauges, the wheels say "AMG", it has the extra set of AMG temperature options to view, it says "AMG on the back, it has the adjustable suspension, and the engine is red. It will easily outpace your pithy 350 any day of the week or weekend. So, in my mind, it Is an AMG. And in spite of your totally offensive and lackluster comments - "GO PATS!"

I felt sorry for you tell you made a reference to “PATS.” Now I know you can’t help it. (It’s your car. Drive whatever you want, however you want!)

Your 43 better walk my wife's 350 all day long (we have a GLS450 on order), that's what you paid for! You do have the performance exhaust which is naturally louder than the standard exhaust and equipment as standard that is optional on other models. And yes, it does also have AMG plastered all over it. I think you're completely missing my point and I also was not the one that said anything about it buzzing. My post wasn't to slight your car. The pride and differentiating factor of the AMG vehicles, such as the former "55" vehicles and the current "63" and "65" vehicles, are that the engines are built by hand in Affalterbach by one person each (who then attaches their nameplate to it). The parts for those cars are highly modified and most times come from different suppliers than the rest of the vehicles in the Mercedes lineup. Similar to how BMW basically uses racing engines in the M vehicles, w/ unique parts all throughout. The M276 engine in the "43" vehicles was developed during the Chrysler marriage, related to the Pentastar units, and is built on a standard assembly line in Stuttgart-Bad Cannstatt. AMG engineers have had some influence on the engine and suspension tuning, but you can bet suspension parts between a GLE43 and GLE63 are not the same. The AMG 43's are on the level of M-Performance and S-line vehicles. And then the 63's are on the level of the M and RS vehicles.

But that aside, I'm cool w/ anyone that's a Pats fan! Funny story, last year we went down to the Bahamas for Super Bowl weekend. It didn't hit me that we were connecting through Philly. It was all Eagles fans on the 2nd flight.

Today's score, 20 - 27. A win is a win.