It was implemented in 1974, modified in 1987 to allow 65 on longer stretches, and finally repealed in 1995. It reduced fuel usage by about .5 to 2.2% for the entire US. Today it may be more since the weight of cars has gone up, per this site Drive 55 Conservation Project 3%.
My opinion is nobody has the courage or sees the need at a National Level for the 55 MPH Speed Limit. Senator Warner brought it up, but he was retiring giving him the freedom to speak out.
References:
- Unmentioned Energy Fix: A 55 M.P.H. Speed Limit from the NY Times.
- Drive 55 Conservation Project
- National speed limit pushed as gas saver - CNN.com
- Would You Drive 55? - TIME
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