Here are the numbers for petroleum engineers (generally the highest paid of all the engineering specialties). Average salary (not average starting salary, but average salary for all petE's) is $83370. And remember that PetE's are generally the highest paid engineers. Hence, that's a far cry from saying that all engineers make over 100k.
http://stats.bls.gov/oco/ocos037.htm
Personally, I am not particularly incensed about the supposedly high pay that engineers make. If you really want to talk about big money for your degree, how about those guys who get easy, do-nothing majors where you never have to study and you can still get top grades, like the Social Studies major at elite schools like Harvard, and then end up getting jobs as investment banking analysts on Wall Street. First-year I-banking analysts can pull in more than 125k (salary+bonus) in their first year, and can pull in over 200k in their third year. Then they can go to business school to get their MBA from Harvard, MIT-Sloan, Wharton, or other such places and then go right back to Wall Street and really clean up. If you have your MBA and you have 10 years of experience at a major Wall Street bank, your compensation is easily over 500k, and is probably over a million.
http://www.careers-in-finance.com/ibsal.htm