What car do you drive? I have a 2011 Honda Odyssey and when it is installed into my car my husband can still drive with the seat all the way pushed back. The car seat comes close, but does not touch the seat of the driver.
I can get some measurements tomorrow as I currently have it taken apart for cleaning.
Most convertible car seats are installed at a more upright angle than a baby bucket or infant carrier such as the Chicco Keyfit.
The above picture will give you an idea of it installed in a 2011 Honda Odyssey on the jump seat, the drivers seat is pushed all the way back and my 3 year old who is 36lbs is in the seat as a model. The headrest is set to the 7th notch which is the highed setting you are allowed for RF.
LMK if there are in particular what measurements you want and I will try my best to get them.