Enough that with the seat all the way back, at 6'6" I can comfortably drive the car.
I just went on a Thomas cook plane yesterday lol. The leg room is ok, I could fit in it and I'm pretty tall. Don't pay for extra leg room, the seats are reeeaaly narrow and hard to get into.
The amount of leg room in the front seats of a Porsche 911 is 44.6 inches. The amount of legroom can vary each year.
Capacity for each leg for VT700 and 750 For 1986 and on it is 442.5 - 447.5cc (14.99 - 15.16oz)
The 2013 Dodge Dart has 42.2 in. of front leg room.
The 2007 Kia Optima has 43.7 in. of front leg room.
The 2011 Audi Q5 has 41.0 in. of front leg room.
The 2013 Lexus IS-F has 43.9 in. of front leg room.
The 2006 GMC Savana has 34.8 in. of rear leg room.
The 2009 Hyundai Elantra has 35.0 in. of rear leg room.
The 2012 Chevrolet Suburban has 39.5 in. of rear leg room.
The 2004 Mazda MAZDA3 has 41.9 in. of front leg room.
The 2003 Ford Explorer has 43.9 in. of front leg room.