Hello all and hope everyone is well. This question is primarily for EQS owners of 2+ years. As the title says, I went for from a 80% charge = 330-340 miles to now 253-255 miles. I have been noticing this for the last month that the range has declined precipitously. I have had the car for 2 years and driving habits haven't changed. This time of year in NJ, temperature is also not a factor and the only change is a new set of tires (Bridgestone instead of Michelins) about a month back. What gives?

 

I wonder if car batteries needs to be "calibrated" from time to time like regular lithium ion batteries?

 

My 2022 450+ has not had this problem, I am still getting 350-370 miles per charge at 80% in the Summer, of course I get less in the Winter, but still more than you are reporting. I have 34K on the clock, charge between 40-80% usually, which means about every third day. I still have the OEM original tires which are Goodyear F1 Asymmetric 5's. Were the tires you bought rated for an EV, with the extra weight and all? That's all I can think of.

 

I can tell you that tires make a massive difference. You do not want the wrong tires. I lost about 20-25% of the range when I switched from Goodyear F1 Asymmetric 5 summer tires, to Pirelli P Zero All Season Run Flats.

 

Totally agree, tires and tire pressures both contribute to fuel economy I mean electricity economy. Higher pressure usually results in lower rolling resistance so better range but rough ride and centre tire wear (if overinflating). Lower tire pressures can result in poorer range however better ride quality but side wear (if underinflating).

 

Temperature drop is a factor. My rough guess is a 1% loss in range for every 5 degree drop in temperature from ideal summer conditions. May not be a straight line loss and be greater at lower temperatures.
Recent driving conditions are also significant. The range will be at max with a low of city driving opposed to long highway drives that result in a major drop is estimated range.
I am still on my first set of P Zero run flat so have no comparison to offer.

 

Agree with temperature being a factor, but I have never had my EQS 450+ estimate a charge below 310, even when temps in San Antonio were near freezing. So 255 mile estimates are astoundingly low, in my opinion. Maybe not for the SUV, but for a 450+. Don't know if tires can do it to that extreme either. And mine only dropped to 320 after driving to DFW at 75mph, with 80 mph runs around Austin, then quickly corrected back into the 350-360 range with city driving. So, I'm having trouble explaining 255.

 

Happened to me get a software update a few months ago. 15-20% drop

 

TIre pressure is what's recommended (I check and adjust every 2-3 mos). Below is a picture of the tires I put on and seem like that might be the culprit as that's the only thing that changed in the last 3 months. Tires are Bridgeston Alenza AS Ultra (35lb each), though I will say that the ride has been very smooth.
Thanks all who took the time and answered.

 

I would bet it is the tires. If they are heavier than the original tires, or have more of their mass towards the tread, then the range loss would be significantly higher. It takes more energy to spin a heavier tire, or one that has the mass farther from the axle.

 

Yup that all makes sense now, I too agree is the tires.

 

It takes more energy to accelerate heavy tires but their polar moment of inertia doesn't effect the energy required to maintain their rotational speed. If you want to talk about the energy required to deform the tire against the pavement that similar to increased width would likely increase the energy requirement.

 

The Audi website shows data on range vs. temperature (for Q4 ETRON). Compared to the range at 20C it drops as follows: 3% at 10C, 23% at 0C, 36% at -10C and 46% at -20C. Thus, highly nonlinear vs. temperature. I suspect the percentage drop is very similar for the EQS