The 25hp high thrust outboards have about 60% more thrust in forward than the 20hp Hondas and 70% more thrust in reverse due in part to the fact that the Yamahas divert it’s exhaust out the leg instead of behind the prop in reverse. Hp is Hp at a given RPM but the things that can really fluctuate between these engines is torque and consumption. These may be minor points in the grand scheme of these option decisions but none-the-less things to consider. Would we prefer to have the diesel tanks which are located in the bilge and have extra storage in the lockers in front of the mast or have the gasoline tanks there and more storage in the hull bilges. Lastly, the tankage location is a consideration. could be transferable between all three engines. Additionally, if we chose the outboard option we could also choose the same exact engine for our tender so that parts, spares, filters, etc.
![inboard vs outboard boat inboard vs outboard boat](https://i1.wp.com/www.bornagainboating.com/wp-content/uploads/2019/01/wake-effects.jpg)
In the case of gas outboards we would potentially have the same fuel source as our tender so that our spare fuel canisters could be extra capacity for both our tender or our main engines. In favor of gasoline as a fuel source, some people like the idea of having fewer different KINDS of fuel aboard. Many people argue that having diesel fuel onboard is safer than combustable gasoline which maybe true in theory but between ABYC standards and the quality that all Seawinds are known to be built to, it is unlikely that we would have a problem with gasoline stored and safely vented.
![inboard vs outboard boat inboard vs outboard boat](https://gorollick.com/articles/wp-content/uploads/sites/4/2020/05/Inboard-and-outboard-cons-header-1014x487.png)
Besides the obvious fuel capacity difference there are some other things to think about in this category. The 3ym30 yanmars come standard with about 95 gallon total capacity with each tank being located in the bilge area roughly centered for and aft in each hull. The gasoline tanks total about 71.3 gallons and are located in external lockers just forward of the mast as to be isolated and vented overboard below the bridge deck. The Hondas and Yamahas obviously run on gasoline whereas the yanmars are diesel.
![inboard vs outboard boat inboard vs outboard boat](https://cdn.dealerspike.com/imglib/v1/800x600/imglib/Assets/Blog/ee/fd/eefdac99-38d9-462e-87fe-133f82446d25.jpg)
We won’t get into exact costs here because they tend to fluctuate from the engine manufacturers and distributors but what we can say is the upgrades to the 25hp high thrust Yamahas costs less than 1% of the base price of the boat and upgrades to the Yanmar 3YM30 inboard diesels costs 6%-7% the base price of the boat.