In the first case;

1%+18%+10%+69% = 98% NOT 100%

It follows therefore that 98% of 128ozs = 125.44ozs

Why 98% of 1 gallon doesn't equal 100% of 1 gallon should be obvious.

In your next "FAI Fuel" calc;

70%+20% = 90% NOT 100%

90% of 128oz = 115.2oz

Again why 90% of 1 gallon doesn't equal 100% of 1 gallon should be - obvious.

Other than overlooking the fact that respectively neither 98% or 90% are equal to 100% of anything, your arithmetic is correct. [sm=spinnyeyes.gif]