Michelin Pilot Sport 4 vs e-Primacy Tyres (20% better efficiency?)

[londiniumperson]

I recently replaced all of the original 17" tyres from Michelin Pilot Sport 4 to e-Primacy Tyres and yesterday drove to London.

See a previous thread of mine:
Will we get home after arriving at destination with 51%

Here's a comparison of the 2 similar trips:
Date: 26/03/2022
SoC at start: 100% & preheated car just prior to leaving
Distance: 98 miles (using Google Maps)
Occupants: Driver + 2 passengers
Had to stop for a charge 9 miles from home with 4 miles on the GOM
Summary: 98 miles using 95% of charge = 3.62 miles/kWh (assuming 28.5kWh capacity)

Date: 30/08/2023
SoC at start: 100% & preheated car just prior to leaving
Distance: 117 miles (using Google Maps) with more motorway driving than the previous trip
Occupants: Driver + 2 passengers
Arrived at home with 4 miles on GOM
Summary: 117 miles using 99% of charge = 4.15 miles/kWh (assuming 28.5kWh capacity)

On the second trip we had intended to top-up for a few minutes at the same Shell service station which we had to stop at last time because it looked like we might not make it, but as we entered the slip road the range climbed to about 12 miles and we had 9 to go. As we were there I thought it prudent to charge, however the connector was totally trashed and the single EV charger was out of service. Therefore I had no alternative but to head home; I drove very gingerly at no more that 55mph and we only just made it with 4 miles left.

Therefore it seems that the e-Primacy tyres are around 15% more efficient that the Pilot Sport 4.
I know there are several factors involved, but it certainly shows that the e-Primacy tyres are more efficient that the PS4's.

[upsilon]

Thanks for sharing these findings, will consider this when changing.

[5thcivic]

Good rolling resistance for our E range, just be careful with speed and torque in the wet.

[5thcivic]

Good rolling resistance for our E range, just be careful with speed and torque in the wet.

[londiniumperson]

Good rolling resistance for our E range, just be careful with speed and torque in the wet.

I’ve not had any issues yet.
It rained heavily on a day soon after fitting and I booted it from a junction that the PS4’s always lost traction on but the e-Primacy were fine. I also floored the pedal on a very wet straight road again with no loss of traction.
When new they appear to be perfect tyre, time will tell if they deteriorate as they wear or if they worsen in the winter temperatures.

Recently I’ve regularly been seeing between 5 & 7+ miles/kWh on short short trips, which as you may know from previous threads this was never possible by me on the PS4’s.

The only downside is that they are definitely noisier, I wonder if the PS4’s had foam inserts to damper them down.