Consumption X75D vs X100D

[KristianW]

Has anyone done a side by side comparison of the consumption of X75D vs X100D?
Or do you know of any reliable comparison test or numbers?
Maybe even how much extra 7 seats vs 5 seats gives in extra consumption?

Last weekend we did a test on a long trip with my parents X75D 5 seater and our X100D 7 seater, wanting to compare consumption between their and our winter tires. I am considering switching to other tires. Our X100D consumed 12% more (we had 247 Wh/km), even with higher air pressure than the X75D on a road trip in Norway. Average speeds here are lower than in the US. Roads were dry. Would be very interesting to know how much of the increase came from the car and how much from the tires.

 

[wdolson]

The tires can have a fairly significant impact. Winter tires can have a high rolling resistance.

 

[KristianW]

I´ll add that my parents X75D is on Continental CVC6 20¨ 255/275 45 and our X100D on Nereus 20¨ 275/275 45. I was considering switching to Gripmax but now I am thinking of Nokian R3 20¨ 255/275.

 

[Yinn]

The tires can have a fairly significant impact. Winter tires can have a high rolling resistance.

Can but not always. My Nokian WRG3s are technically “All Weather” but certainly drive and grab like winters and resulted in a significant decrease in consumption over OEM Contis.

The consumption will also depend on year for year. I believed the 2.5s and up used the same motors for 75 and 100D. But the 100D is heavier, and has a higher power consumption on the top end (faster) which could lead to higher consumption with a heavy foot.

 

[gangzoom]

EPA has all the data, seems to suggest the 75D X is 8% of more efficient than 100D and 10% more than P100D L

Gas Mileage of 2018 Tesla Model X

 

[gangzoom]

The EPA ratings and OPs findings might also explain why I saw virtually identical consumption on my 75D running 22s and a loaner 100D running 20s over the same 10 mile stretch of road in identical weather, with AP set to 85mph.

 

[mattack4000]

I have a new 100x, the difference in consumption to my 75x is immaterial. The only difference I feel is how much faster the 100 is, especially past 40. Both had the same tires too

 

[wdolson]

The EPA ratings and OPs findings might also explain why I saw virtually identical consumption on my 75D running 22s and a loaner 100D running 20s over the same 10 mile stretch of road in identical weather, with AP set to 85mph.

Larger tires are less efficient than smaller tires, so I suspect the higher efficiency of the 75D was offset by the larger diameter tires.

When I was buying new tires I scanned a few threads on tires on this forum. Some people saw a drop of 10% going from worn out tires to new because of the larger diameter and higher rolling resistance. I saw a big hit on the way home because the tire shop didn't inflate the tires enough, but once I pumped them up properly I saw about a 4% hit from the new tires.

 

[KristianW]

I really don't trust the EPA numbers. Look for instance at comparison of X75D, X90D, X100D and S90D. X75D and X90D are very close at 93 and 92 MPG, the X100D has 87 MPG. S90D 435km total range and X90D 414km. I think the difference between S and X is more like 15%. That is what we got on a trip around Europe 2 years ago with my brothers S90D and our X90D. Now we have the X100D and my parents X75D, one brother has S90D and my other brother S75D.

I guess somebody must have compared 75 and 100. Like driving together for an hour or so with same tires, air pressure, warm battery, no slip streaming for 1 car etc. Probably somebody owns both or has done a comparison with somebody.

I belive our Nereus tires consume quite a bit more than my parents Continental, maybe also the fact that we have 275 in the front instead of 255 adds to the consumption as well. I am happy with the Nereus tires but if the Nokians or Continental roll a lot better I do think I want to change to these more expensive tires.

wdolson´s comment about someone seeing a drop of 10% going from worn out tires to new is very interesting as well. Of course I am not switching to worn out tires, that would be pretty stupid

 

[wdolson]

Post refresh the S got better range than the pre-refresh S90D. I have a post refresh 2016 90D with 19" tires and the EPA range on that was 294 miles. My car gets 298, though I have only charged it over 90% a few times.