[caltaxed]

Richard Collins did a study years ago comparing single piston and twin piston aircraft with retractable landing gear and said the twin had 4X the fatality rate (see the link below).

Improved training and other corrective action measures have improved the safety of twin engine piston aircraft but insurers are still leery.

https://airfactsjournal.com/2011/12/50-years-ago-in-air-facts-double-trouble/

[caltaxed]

I misstated his 4X number. The correction is: “One twin was four times worse than the average of the singles. The single-engine retractables were better than the twins, too, with the record of the worst retractable more than twice as good as the record of the worst twin.