Jane-DoH
You could fly the RF104G comfortably for 1hr 40min plus at low level, cruising most of the way at 450kt, with the occasional push-up to 0.9 Mach (approx 600kts) for a target run. This would be with 4 external tanks. A/B only used for T/O. I can recall regularly seeing 360 miles plus on the RBI range to home base, all flown on a LO-LO profile. Always felt like a long way from home after my time on the Harrier!
Though I never tried it, I was told that with no tanks at all you could cruise for an hour at 600 kts at Max Dry, landing with 1000lb.
A2QFI
A scurrilous Jaguar rumour within the Harrier Force was that the runway controller had to go out to each a/c before rolling to check that both reheats had lit - by sticking his hand behind the jet pipe!
I'll get my hat and coat...