T16 isn't gonna get close to 160mph with a mere 220bhp ! It would need a spectacularly low CD figure, and it would need to lose the 4x4 (huge transmission loss). It won't hit 150mph real-speed in real-life.
Take a look for yourself - even very sleek FWD cars (Calibra Turbo, Astra Coupe Turbo, 406 Coupe) etc. would struggle to exceed 150mph with 220bhp.
I have no idea. I got about 250miles from a tank of fuel. I *think* it was a standard 50l tank.
I get very similar economy from the 3.0 Coupe now - it's a 70l tank (!!!) and I get around 350 miles from it.
:)