On 5/31/2013 10:46 AM, Wayne B wrote:
On Fri, 31 May 2013 09:51:05 -0400, Hank©
wrote:

At cruising speed,my boat gets 6.7 GPH towing a dingy.

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Gas or diesel, what kind of boat?

We use about 8 gph towing a dinghy in flat water/no wind. That's with
twin diesels running at 8 to 8.5 kts. In rough water we hoist the
dinghy up on deck.
9.3 L 570ci 350 hp 1150 ft-lb International single straight 6
cruising at a modest 52 kts.
37'4" long, Beam 8' 4", Approx 15t, and towing 3700lb dingy. In rough
water we will sink.

That's more information than some of the scaredy cats in rec.boats are
willing to reveal.