Mmmm... Pete, thanks for reminding me.
My old Johnson 150VRO had a big drinking problem.
At 25-30Knots on my 6.5M Ocean it could quite happly do 3l a mile.
I used to call it the petrolator.
They might appear to be cheap power, but a day out in the boat became very expensive, and my range was non existant.
It didn't help that it struggled to power the heavy ocean and was run at high throttle settings to give a decent cruising speed.
By comparison the Suzuki 200EFI I run now can cruise the Ocean along at 30Knots on much lower throttle settings on @1.25 - 1.5l a mile. And I've seen 52 knots recorded on the GPS.
Bearing in mind the engine is a 98 model, that cost me little more than £2k to buy used, and by fitting it myself was a very cheap, but fantastic transformation of the RIB.
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club