I'm not sure why, but I generally hear even higher consumption figures quoted for these old twin guzzlers
I suspect it is because the ones you heard about are flown by pilots who are ignorant of modern operating procedures.
The engine doesn't care if it is in a single or a twin.
But yes an old twin will be relatively expensive to run because
- you have 2 engines and some ~80% of the 2nd engine is used to pull along that engine, plus the now substantially larger aircraft (longer wings are needed because the engines take up a fair bit of them, for example)
- most twins are very old and an old plane will tend to have a significant appetite for airframe parts (true for old singles too of course but a twin has more bits on it)