Is it possible for an SUV to have better fuel economy than a (5 year old) Sedan?
2 friends of mine: One owns a Lexus LX 570 SUV (not sure if it's a 2018 or 2019 model) and claims that it can go about 700km on a full tank.
The other guy owns a Ford Fusion 2014 (Sedan) and says that his can go about 470km on a full tank. (apparently, It used to go about 600km when it was new).
How could this even be possible? 
Simple. The Lexus has a 24.6 gal tank, the Ford 16.5 gal. Assuming they're using the same kind of gal (those metrically impaired units are a mystery to me), that alone would be sufficient to explain that difference.
Yes but the fact that your friends suv can travel further on a full tank does not mean it is more efficient than the sedan. It could have a fuel tank twice the size of the sedan.
The estimated fuel economy for the Lexus is 13/17mpg Fusion 25/37mpg
The Lexus could be a hybrid.
The Toyota's tank would hold more fuel one would assume 700k's is a pretty ordinary range most Toyota's have 2 tanks that will do over a 1000k's out of both of them some of the diesels closer to 2000
Lexus is built by Toyota. So it doesn't surprise me that it is more fuel efficient than the Ford which is crude by comparison.
What's the volume of each fuel tank? I'm guessing the Lexus LX570 ( which, even by SUV standards, is not a fuel efficient vehicle ) has a much larger fuel tank and that, combined with careful driving, gives it a longer range between fill-ups
Different cars have different size fuel tanks, so different distances on a tank of fuel.
Not all fuel tanks are the same size, Skippy. My Ram pickup can go 500+ miles on a tank of fuel, but it's a 28 gallon tank! My wife's Subaru can go the same 500 miles, but it only has an 18 gallon fuel tank.
My 2018 Subaru Crosstrek will go about 800km on a tank.
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