It's not the same 5.0 from Ford, but commonly thought to be since there are a lot of Ford parts on the motor and Ford manufactured the motor under contract to JLR.
Common 5.0 issues are timing chains and guides (biggest $$) and coolant crossover pipes, particularly the front is failure prone and considered a maintenance item. Some say change the front crossover pipe every 60k miles, others 90k miles or whenever it starts leaking. It's not what I would say expected, but some people have reported catastrophic failure of this crossover pipe which lead to an engine overheat ruining the engine and mechanically totaled the car. It has happened, but I'm not sure it is a statistically significant number. The timing chain issue has varying opinions. Some say it's a "when" not "if" situation that it will need to be replaced. Again, I'm not sure that's really the case, but internet searching for Land Rover issues is sort of like shooting fish in a barrel. More frequent oil changes than the 15,000 mile interval in the manual should be a given. I'd never buy an LR4 without knowing the maintenance history.
These were EPA rated 13 mpg city and 17 mpg highway. I get about 14 mpg depending on speed. Slowing down definitely improves mileage substantially, but they will be very thirsty due to simple physical limitations. LR4s are very heavy and aerodynamically challenged.
I love my LR4 due to capability and usability of the interior. It's a great family hauler, utility vehicle, hunting truck, and luxury cruiser all in one. That said, I'd never recommend one to someone that didn't specifically need all of that capability and know (or be) a good independent Rover mechanic that could keep them out of trouble. In my case, I drove a 4Runner and felt like I had been beaten with a baseball bat. I drove the LR4 and felt refreshed. Price of maintenance = worth it. Your experience may vary.
The way you have to look at the LR4 is that you can buy an LR4 for $14k (or whatever) or similar a Land Cruiser for $45k. The price of the Land Rover is the price of admission, not operating and maintaining. The price of the Land Cruiser is, in my opinion, over priced, but will generally just work and require fairly basic and comparatively inexpensive maintenance while being similarly thirsty. There's convergence after a while for total ownership cost. If you don't have experience and expectations of extra maintenance costs and requirements of a European vehicle, I would steer clear. You really have to love a Land Rover to enjoy, and justify the cost, of a high mileage Land Rover. If you tell your wife that it's a deal because it's $14k and then think she'll be upset if you spend $5-8k catching up on deferred maintenance in the first year, then don't buy the LR4.
Back to your regularly scheduled LR4 maintenance...