I was driving my friends Essex that runs a 502 with injection..... it was pretty good on fuel considering how fast we were running,,,,, I was running between 65 - 70 from Moabi to just past the sand bar and then from the no-wake zone to just past the river mouth......the fuel gauges didn't really move as much as I thought they would...... carbs are really hard on fuel.... then again jet-drives weren't designed for fuel economy either.