Hypermiling legal constraints - MA I did a little research to find out what hypermiling techniques are legal in MA, what aren't, and the consequences. Caveat: I'm not a lawyer. MGL Ch. 90 spells out most of the motor vehicle law: http://www.mass.gov/legis/laws/mgl/gl-90-toc.htm The Mass Pike (plus Central Artery and tunnels) have their own regulations: http://www.masspike.com/aboutus/regulations.html Fines are listed at: http://www.mass.gov/courts/courtsandjudges/courts/districtcourt/trans924revisedcmviassessments.pdf Driver's manual is at: http://www.mass.gov/rmv/dmanual/index.htm Surcharge Points values (p. 124-135): http://www.mass.gov/Eeops/docs/mrb/AdministrativeProcedures.pdf Of interest to hypermilers: - On the Mass Pike, the minimum speed is 40 MPH except in climbing lanes. Violation carries a $20 fine/2 points. On other limited-access highways, the driver's manual considers 45 MPH to be the safe minimum speed. Obstructing traffic (e.g. blocking traffic by going too slow) on any public road carries a $20 fine/2 points. - Coasting (operating with gears disengaged) on the Mass Pike carries a $100 fine/2 points. I haven't seen any regulations governing coasting on other public roads. - Tailgating has a $100 fine/2 points on the Pike and a $20 fine/2 points on state highways. Countering the gas-wasters, MA has a $100 fine ($250 for second offense) for idling more than 5 minutes (unless the engine is needed), and leaving an idling motor vehicle unattended is illegal as well ($35/2 points for first offense, $75 and $150 for 2d and 3d respectively). Perhaps others would care to research their respective jurisdictions and post the results here for reference.