You can't just give numbers for every car as motion ratios and % are different between a lot of cars so they can't be used as a general number for all cars.
The static RF numbers between a blue/grey rocket maybe be an easy 100# difference from an XR1 and more on other cars. Fronts will typically be way closer between different cars then the rears can be. Some may be really similar and others could be 200# different at static.
Just to show you on the RR you asked about, I've been as low 175# and as high as 700# so.....