[mgrant]

I have a 175hp HPDI on my 2003 210CC. The best mileage I have seen for a day (over 50 miles) is 4.28. The worst is 2.62. That day involved a lot of trolling at 8-9 knots, definitely not the boats sweet spot.

I use a Navman 5500 for constant fuel economy readings. It never ceases to amaze me how little adjustments in speed, trim, tabs and/or load can make up to a 1 mpg difference at cruising speeds. I get it dialed in as close to 4 mpg as I can and off I go. With the miles/hours I put on my boat and the cost of fuel, I have paid for the Navman in fuel savings....and increased my range.