Here are the top rated engineering schools by US News, (which only does the rating for the graduate program.  But the percentages given below are for the undergrad courses.)  What we see here is that schools with the strongest engineering programs have relatively good use of Fridays.  The only schools that drop much below 40 percent are either Ivy League or big city or both, previous observations.  So,  while some of our top schools in the Ivy League and in big cities may be setting a bad example,  other of our top schools, flagship and engineering are resisting the four day temptation.  It doesn't take much imagination to see why engineering schools would take what they teach more seriously.  Flagship schools may have strong engineering programs or they may just see the value of five day work week.

1	Massachusetts Institute of Technology 46% of courses have class on Friday S014
2	Stanford University does not allow outsiders to see its schedule of classes
2	University of California—​Berkeley  44% of courses have class on Friday S014
4	California Institute of Technology  43% of courses have class on Friday S014
5	Carnegie Mellon University  48% of courses have class on Friday S014
6	Georgia Institute of Technology  45% of courses have class on Friday S014
6	University of Illinois—​Urbana-​Champaign   44% of courses have class on Friday 013
8	Purdue University—​West Lafayette   53% of courses have class on Friday S014
8	University of Michigan—​Ann Arbor   37% of courses have class on Friday F013
10	University of Texas—​Austin (Cockrell)    41% of courses have class on Friday F013
11	Texas A&M University—​College Station (Look)    39% of courses have class on Friday S014
11	University of Southern California (Viterbi)     36% of courses have class on Friday S014
13	Cornell University  36% of courses have class on Friday F012
14	Columbia University (Fu Foundation)  12% of courses have class on Friday F012
14	University of California—​San Diego (Jacobs)    55% of courses have class on Friday S014
16	University of California—​Los Angeles (Samueli)  32% of courses have class on Friday 012
17	Princeton University   24% of courses have class on Friday F012
17	University of Wisconsin—​Madison 47% of courses have class on Friday F013
19	University of California—​Santa Barbara   36% of courses have class on Friday S014
19	University of Pennsylvania  29% of courses have class on Friday 012