The XJR is having the same engine present in the XFR-S ;
XFR-S does the 0-100 sprint in 4.4 secs.
The interesting thing is that the XFR-S weighs about 1987 kgs
& the larger XJ R weighs 1870 Kgs (XJ Super Sport weight taken for reference)
So the 0-100 timing of about 4 secs is quite achievable.
* Weights as per Jaguar website
Also note the weight of an F10 M5 is 1945 kgs
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