Mr 88 wrote:What does your 27 inboard consume per mile at cruise?
Your question to me is an old debate technique of "begging the question". Your argument presumes two conditions that are not true, then uses them to support your position, that is, unless I owned a 27 FULL CABIN and personally recorded its fuel consumption, I cannot answer the initial question.
It was your response to the initial question that introduced the notion of fuel-consumption per-mile. The initial question only asked for the "fuel consumption" and did not specify how the fuel consumption was to be specified, that is, whether in terms of per-hour or per-mile. My reply specified an estimate in fuel consumption per-hour, and your reply specified fuel consumption per-mile.
Your question makes two bad inferences:
--that I own a 1998 27 FULL CABIN boat with twin inboard engines of 5-liter displacement. I do not; and,
--that my reply contained an answer in terms of fuel consumed per-mile; it did not.
Your question is inappropriate for me to respond, as it incorrectly suggests or implies that the estimate I provided was based on first-hand operation of the boat and having recorded its fuel consumption on a per-mile basis. The estimate of fuel consumption I provided was not based on a gallon-per-mile basis, and was not based in any way on the actual boat performance. My estimate was based entirely on one assumption: the engine horsepower would be 250-HP each for a total of 500-HP. This was the only reasonable assumption I thought could be made, owing to the vague question that was asked.
In any case, if the engine horsepower were different from my assumption of 500-HP total horsepower, my method of estimation was clear and could easily recalculate the estimated fuel flow rate in gallons-per-hour.
For example, if the engines under discussion have only 230-HP each, my estimate can be easily recalculated:
460-HP x 0.55-lbs/HP-hour = 253-lbs of gasoline/hour
Assuming gasoline gas a density of 6.25-lbs per gallon, 253-lbs/hour will be
253-lbs/hour / 6.25-lbs/gallon = 40.5-gallons-per-hour