You might want to revisit your math. From what I recall, human hearing perceives a 10db increase being twice as loud. 1db is the smallest difference most humans can detect, depending on frequency.
For example, if you double the output of an amplifier through a speaker which can handle it, only a 3db increase will result. This is not perceived as twice as loud, but instead 30% louder. That's why it's so difficult to get audio systems to achieve really high volumes & still be clean. It takes an exponential increase in output to double perceived loudness.
Working with amplified sound systems is a bit different than pure acoustical noise. You have the mechanical/air interface, the impedance of the electrical driver and the acoustical impedance of the room, resonant frequencies to deal with, harmonics, reflections, etc. [In a earlier time of life, I designed and tuned sound reinforcement systems.]
Human hearing perception is different than energy emitted. One is linear (the energy level) the other (hearing) is not.
10dB is 10 times the acoustical power.
So, if the Honda is running at 54dB and the other is at ~70dB, then there is a 16 dB difference.
In power calculations, 10dB is 10 times. 6 dB is 4 times. So 10x4 is 40 times more acoustic power coming off the generator.
The old rule of thumb is that a human cannot detect less than a doubling [+3dB] of acoustical power. However, newer research shows this is incorrect. Many humans can detect level changes of as little as 1dB under some conditions.
So, yea, I exaggerated at little [or a lot
]. But it is putting out 40 times more acoustical power than the Honda. BTW: Power and pressure calculations are different. Power/energy uses the power formulas for dB. [dB=10LOG Pout/Pin]. Pressure uses the voltage calculations for dB. [dB= 20LOG Vout/Vin].
If we are talking sound pressure only, then it's in the range of 25 x the sound pressure, not 250. I guess I added a 0 somewhere in my head
Sorry 'bout that. I'm in spreadsheet hell here in Montana. When stressed, I should not do quick in-the-head estimated calculations and post them
But no matter how you calculate it, a generator that outputs acoustical noise at 70dB will not win you any friends among your neighbors that are less than 300' away.