I owned a 2002 380DA and I currently own a 2003 410DA. My 380DA had the 8.1Horizon gassers and my 410DA has the CAT 3126TA diesel motors. My 380DA would burn approximately 34GPH at 22-24K cruise and my 410DA burns approximately 21 GPH at 21-23K cruise. I've kept very accurate records for both boats. The 380DA had smartcraft. The 410DA has no electronic means of measuring instantaneous GPH. My record book for the 380DA was lost during a house remodel, but from memory, I would "AVERAGE" 0.80 sMPG over a seasons worth of use. The 410DA "AVERAGES" 1.0 sMPG over a seasons worth of use. These are real numbers. The 410DA diesel is burning 25% less fuel than the 380DA gasser. The 410DA-D is more effeicient and even at today's diesel prices, it's more economical.
I just filled my 410DA yesterday. I logged 236 miles on that tank and I took on 213.4 Gallons (1.1 sMPG). I had the fuel delivered to my dock (behind my house) for $4.339....didn't have to burn any fuel going to get fuel. In NJ, I can't do that with gas.
The 410DA is a few feet longer, 1 foot wider and few thousand pounds heavier. It gives a more solid ride than the 380DA gasser. The extra head has proven it's worth many times. Otherwise, the two boats are very similar in design.
The 380DA was/is a great boat. I would never say it was a 'dog', but it did like to drink the dino juice. The 410DA-D, IMHO, is a better choice.