Mate I had that engine in a HZ sedan about 15years ago, I can't remember the fuel consumption. It wasn't so bad then fuel was only 70 cents a liter or so. It was in front of a m21 with a statesman 2.78 diff. Real low revs on highway bit hard on a hill start with taller first but was manageable back then you just come off the clutch and nailed it so wasn't a real issue. I had a smaller Rochester carb of a blue 253 so it was about a 550 I think. I kept the engine when I fitted a 308 to the sedan because it was a little ball terror. So it's in the rack with all the others.
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