I think the idea here is to go several hundred miles on the
least amount of fuel.
Very few cars can claim the 650-750 miles per tank with a sub-20 gallon tank....they include the E250 MB....Passat TDI.....Cruze EcoDiesel....and Jetta/Golf TDI's. Probably the Audi A3 Diesel also, but its the same as a Jetta realistically. Amazing how few cars on the market can do it. In 51k miles I am planning on stripping the DPF from my TDI with a delete kit when the warranty is done, which should boost MPG noticeably.
With a diesel you can beat on it and it will just use more fuel, with a hybrid the car is going to power down and start crying at the side of the road.
My 190d frankencar can do about 350-400 miles...but that's because it has a puny 14ish gallon tank. I have been seeing about 30mpg.
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-diesel is not just a fuel, its a way of life-

'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)