Here in the states, in 1996 congress passed a law stating the all vehicles should get 50 mile on reserve. Before that, it was like the wild west and it varied from vehicle to vehicle leaving people stranded. With that said, I can tell from this thread, not many of you are familiar with what I just stated.
With that said, it's obvious that it depends on your driving skills.
The DRz400 I sold had a small tank. I was getting 70 mpg with it. I still had 1/2 a tank when I had to switch to reserve by way of the petcock. i was going to cut the petcock tube down to get more out of the tank before switching.
My current Stratoliner left me sitting on the interstate, 28 mile after going into countdown mode. I was running along a speeds better than posted. Big bores suck fuel at speed and I paid the price for being stupid. lol
With my current CBR1000F, I have gotten 45 mile with the fuel needle in red before fueling up.
My current S10, I have gotten close to 50 miles after it switched over to countdown mode. This is with bags on, fully loaded and running at highway speed with cruise on.
My current CX500 cafe racer just sits in the garage and needs a new home. LOL
I just retired but used to rent several car a year after flying in to areas. Some time I drove hundreds of miles to get to work sites. My vehicle of choice for driving is the Nissan Altama and second would be the Maxima. The Altama has a big tank and good fuel economy. I have driven 550 miles without the light coming on. This car can get over 600 miles on a tank.
600 mile on a bike is different. At 68 1/2 years old, I never pass up a gas station or piss brake or any combination of them with coffee included.
EDIT: What was said about CVT's above.
CVT's keep the engine in the power band where it is most efficient. They use the gearing to adjust speed to the input of the throttle peddle. This is how the Altama gets such great range for the size it is with about 39 mpg highway with normal driving speed.
Smaller displacements always get better fuel economy, so, 1000cc two banger usually gets less distance than 1000cc three banger on same fuel.
There are several cars and trucks switching to smaller displacement engines with turbos and CVT's.
The Ford Mustang dropped the V6 because the turbo-4 has more power, its lighter and gets better economy. It doesn't have CVT but instead uses an 8 speed transmission.
The Honda Africa Twin and Goldwing are going in this path with the DCT.