Help buying a Patrol

[dom14]

RD28T Other than some having head or heating problems, cracking cam gear, harmonic balancer key shearing off and pump wear and tear, they are a slow, but reliable engine.

TB45 petrol are thirsty but reliable.

TB48 really thirsty but powerful and reliable. A forum member had the head modified for better air and exhaust flow and is really happy with the result.

TD42 the best of the bunch.

Some guys are claiming to get 100km/18L from TB45 on highway.
If that's correct, it is not too far off RB30 economy, and I would definitely retire RB30 in favour of TB45.
Put TB45 on sequential LPG injection and the economy should get even better.

What do you reckon? Is there any truth in the above TB45 claim?