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New Model Y RWD Long Range - not impressed with the efficiency so far

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3.8K views 24 replies 14 participants last post by  wja96  
#1 ·
I picked up my new Berlin-built Model Y LR RWD in Glasgow on Friday and having done nearly 500 miles (mixed driving but quite a bit of motorway and A-Road) it’s averaging 309mWh/mi or roughly 3.3 miles per kWh whereas my old Model Y RWD with the 58kWh LFP battery averaged 243mWh/mi over 49,800 miles. With all-season tyres on. To hit it’s claimed range of 371 miles it needs to average 209mWh/mi so it’s miles out.

Im not entirely sure why I thought putting a 50% (bigger capacity and heavier) battery would give the same or better efficiency, but I did and I’m currently NOT very chuffed. I did 70 miles this morning with the heater off (12C outside temperature) and it got down to 260mWh/mi over the trip but I never broke 60mph the whole way and most of it I was following a Buffaload at 56mph so I would have expected 200mWh/mi rather than 260. Currently the crap efficiency is cushioned by the free supercharging but from the end of the first year I’ll be paying for my own electric so it needs to be closer to 250 than 300.

I may not have it dialled-in quite right - the settings are the same as my old RWD - Chill mode from collection, and Creep mode and it‘s 42PSI cold tyres. This is with the standard 19” Hankook tyres and I’m dreading putting my Goodyear Vector 4Seasons on later this week.

I‘m also quite surprised that the Berlin build quality isn’t as good as Shanghai - the panel gaps are bigger (I measured them) and the doors need a really hefty shove to close them but they have fixed the positioning of the seat-belts so they no longer cut into your neck. The software also seems to be slightly different between the two cars (Hardware 4 vs Hardware 3?)

Any suggestions on how to boost the efficiency?
 
Discussion starter · #3 ·
EV Database says 267mWh/mi for the RWD and 268mWh for the LR RWD so pretty similar - not the 60mWh/mi difference I’m currently seeing.

I will raise an issue with Tesla tomorrow.
 
Discussion starter · #7 ·
I'm getting similar (or slightly worse - around 3.2 with a roughly 33:67 mix of urban and 75mph motorway) with an Ioniq5 84kWh RWD.

Likely the mixed weather.

Doubt there's an issue, though Ioniq5 is not Ioniq 28/38 for efficiency!
I don’t view the Ioniq5 as a particularly efficient car. The original Ioniq was. The one I borrowed was doing 5 miles per kWh on the motorway and 6.5miles per kWh in town. My old Kona was pretty decent too.

All Tesla’s should be able to average 4 miles per kWh (250mWh/mile). If you look at the claimed WLTP range figures for the Ioniq5 they’re nowhere near what Tesla claim for the Model Y. I’m looking at 2 nearly identical Model Ys, the only difference is the bigger battery (and possibly the motor is different) and the efficiency is definitely significant worse. It’s at least 20% worse. My old RWD was doing 4 miles per kWh when the outside temperature was sub-zero. It was 12C yesterday, heating off, tucked in behind a tall truck at 56mph and it still couldn’t crack 4 miles per kWh. That’s not right.
 
Discussion starter · #16 ·
Common knowlege claims Shanghi build quality is the best. HW3 and 4 might be getting updates at differnt times because of FSD software diffrences.

My HW3 model 3 just got a software update that made many small changes to the user interface. For example the park assist display is improved. I need to go look for documentation.

Does HW 4 seem to help with autowipers and cruise control?
No, windscreen wipers are still Beta, cruise control is still Beta and they seem to have removed the audible over-speed warning that I always relayed on to let me know I was speeding. And yes, I know I should be aware of the speed limits at all times but I’m not perfect and the three sets of bongs always let me know Id missed the sign.
 
Discussion starter · #19 ·
I turned all that audible nonsense off, was it not possible to do that before? I live and drive mainly in and around Milton Keynes. Between our twenty gazillion roundabouts we have roads with speed limits that are all over the place - ranging, seeming randomly, from 70 to 30. All that bonging drove me round the bend till I found a way to silence it.

The damn thing still insists on messing with the steering every time I go near a white line to avoid one of the many potholes though. Going through menus to turn that off every time gets very old very fast. I really wish politicians would keep their noses out of things they clearly don't understand.
So basically you speed, and you don’t use your indicators to change lanes. And you think it’s cool to brag about it on a public forum. At least I know I’m a crappy driver and I appreciate the help I get from the safety driver aids.
 
Discussion starter · #22 ·
If you need an audible cue to tell you that you're speeding, I don't want to be in the car with you. Thanks.
As for using indicators, I think you need to re-read my post.
I’d rather be in the car with someone who was aware they sometimes missed a speed limit sign and slowed down when a warning sounded than someone who is annoyed by the speed warnings because they are knowingly exceeding the speed limit.

And if you switch off ‘assist’ on the line crossing it only pulls you back if you’re crossing a line without the indicator running and you’re about to either leave the road or something is overtaking you/in your blind spot.

If you think about the WHY? you don’t want the car curbing your speeding and stopping you crossing white lines you might want to wonder why anyone would get in a car with you.

It always strikes me as odd that people complain about the driver aids when all they do is stop you driving badly.
 
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Discussion starter · #25 ·
I was watching the speed limit indicator last night as I drove home along a 70mph dual carriageway, the thing was on autopilot (dunno why they can't just call it cruise control like everyone else). As the car went over a bridge, it decided the speed limit should be the limit of the road under the bridge, 30mph. This is where the whole thing falls flat on its over regulated and controlled face. Luckily the the car didn't throw out the anchors, it just started to slow before I poked the accelerator to override it.

Same thing happens regularly on the M1 Northbound at Newport Pagnell Services - there's something on the walkway over the motorway that confuses the car. Driving up there with the autopilot set to 70, it suddenly drops to 60 as you go under the walkway.

The Tesla, with its total reliance on cameras for everything is a nightmare sometimes - it reacts to things that don't exist, pulling at the wheel, bringing up messages onscreen accompanied by panicky bongs when it sees a shadow. I've had it apply the brakes in panic because it thought I was going to hit a truck - it was parked in a layby but it was inline with where the car thought it was going due to the camera, we were on a slight bend.

The way these systems work at present, you have to be more alert to the car doing strange things than ever before instead of just looking out for other road users. We're actually going backwards in terms of safety. I guess they've done all the things that make sense, now they're just desperately looking for things to justify their existence.
But none of those things are related to my wanting to be warned when the speed limit changes and I’m going too fast. They’re all irksome but you can’t turn any of them off.

Your point seemed to be that even through you claim to drive at or under the speed limit and only cross white lines having indicated and checked it’s clear STILL received warnings and tugs in the steering wheel. I suspect you’re being a little economical with the actualité.