Weight at sea level vs. weight at 7500 ft

For 5-foot-tall units: A 32 refrigerator or freezer weighs about 150 pounds and takes up 38 cubic feet. A 32-inch refrigerator or freezer weighs about 200 pounds and takes up 44 cubic feet.

These are not the same, so cannot be directly converted.

Pounds per sq ft is a measure of pressure, while lbs / cu ft is a measure of density, weight per unit volume.

I think maybe what you are doing here is converting the weight of concrete in a 1" slab, where a sq ft would contain

1 x 1 x 1/12 = .0833 cu ft

The figure of 150 lb/ cu ft is correct for the average density of concrete, so the above slab would have

1/12 x 150 = 12.5 lbs/sq ft at 1" thickness

BTW that is a thin slab of concrete, insufficient even for a light-duty pathway. If you are referring to a screed for tiling or similar, that is cement.

Here is how I would solve the problem starting from the expression for the gravitational acceleration as a function of the radius. You might not like the fact that I use SI units, but I will show you how to adapt my calculations to suit your needs.
The ratio of the acceleration at altitude h to the acceleration at sea level is a pure number (no dimensions). Just express the Earth radius and the altitude in the same units and your result will be correct.
To get the weight you can write
w(h)/w(at sea level)=g(h)/g, or
w(h)=150 lb* g(h)/g and your result will be in pounds.
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GPS uses satellites to determine position and altitude. Depending on where you are, above or below sea level, it may say you are flying in the air or a few hundred feet below the water. YOU have to determine what your mean altitude is by knowing what the local altitude is above or below sea level. If you were in Denver, Colorado, it would tell you that the boat was about 5,341 feet up in the air. In Death valley you would be below the water because it is below sea level, -272 feet.

it its fuel injected it will have an atmospheric pressure sensor that compensates for altitude. if its carbs you may have to alter the height of the needle and slightly smaller main jets

Typically, When you go over 3000 ft above sea level you should adjust the calibration or jetting in the carbs. If the bike is very sluggish at 6200 ft you may have to lean the carb out by installing smaller jets and lowering the needles. the carbs are very intricate and should only be serviced by a qualified technician.
Thanks and I hope that this helps.
Steve

same dyno? same operator? theres something wrong. the lower altitude the better, as far as I know. But someone thats smarter than me and has high altitude /dyno experience would be better to answer the question.

Direct quote from 2001 Mitsubishi Product Catalog Specs. Gold Series

VS-70707

Weight (approx. lbs.) 365

The system is not affected by altitude in this way, the thing you need to check is fuel pressure, this may be pump related.