Two things that aren't realistic in a scenario I've had with a vehicle after running out of fuel while driving:

• The engine audio stops but the tachometer continues to work. The driving wheels should lock up unless the clutch is engaged or car is put into neutral
• Deaccelaration while coasting is not implemented. I've observed this when the vehicle ran out of fuel as well as intentionally accelerating and stopping, the vehicle's speed remains pretty much the same although it does increase going down hills as expected.