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Thread: Speed Reduction - 55 MPH Limit Reply to Thread
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Topic Review (Newest First)
12-05-2015 10:35 PM
DEADPOOL i dont mind a 60mph limit, but not 55. ill never get anywhere going 55,lol.
12-05-2015 02:56 PM
metallicnotazx5 I don't know about you guys.But at 70-75mph is when every single one of my vehicles has gotten best fuel mileage (not sure about the 2015)

1997 neon - 40mpg consistently at 70-75mph 75 miles round trip up and back 271 for 5 years It may have been saving fuel by fuel injectors not injecting fuel all the time.

2006 Focus - Best tank was 46mpg 90mph with a strong tail wind on a 100 mile stretch of 30.

2006 Trailblazer 28mpg 70mph on 71 to Columbus 118 miles shortly after the speed limit was raised

2012 Elantra - 44 mpg 80mph WVA Turnpike.
12-05-2015 01:52 PM
BlkRidr I can remember back during the 70's when there were long line because of gas rationing and when the national speed limit was 55. It took forever to get anywhere long distance. It was also when cars got crappy gas mileage. Because of the advancement in car's engines, aerodynamics, transmissions, and emissions , I feel there's no need to impose another national limit
06-22-2015 12:37 PM
RonMaiden Well,obviously that 55mph bill died a long time ago so what is the point debating this anymore? Speed limits didn't change and many states in more rural areas have upped the limits.
06-15-2015 07:14 AM
Mk3GrL12 In the state of WI, they are finally changing are speed limit to 70mph
04-09-2015 07:39 PM
Phordman I know I get the same at 70 as 60. IMO 55MPH speed limits are dangerous. long drives drivers get board, their mind wanders they do not have to pay attetion lumbering along at such low speeds. I typically drive 75~90 on I15 thats a 70mph zone (flow of traffic) and over 500k miles now. Im assuimg had I driven 55 all the time I would have been "milti tasking" and would have been involved in some kind of fender bender
02-28-2015 01:27 AM
Young_And_Focus I do believe I've had my history lesson for the day....
02-27-2015 06:30 PM
stevetimm
Quote:
Originally Posted by FordFan1265 View Post
This 55 MPH saves you gas "fact" is bull with some cars.

I pay attention to my avg MPG in my 3rd gen Focus and I get my best in-city mileage at 45 MPH, and my best highway mileage around 70 MPH (72 to be exact).

When I actually lock in the cruise control at the 60 MPH speed limit my avg MPG actually levels out at about 0.2 MPG lower than if I lock it in at 72. And if I slow it down to 55 my MPG lingers around 0.3 MPG lower than at 70.

This may be due to the shift points and RPM's involved with the DCT. It may be something with the aerodynamics of the newer Focus at higher speeds. It may be highly dependent on outside temperature and road conditions. A lot might be factoring in... All i know is that my best MPG's are seen at 45 and 72...

This MPG trend was observed in my 2012 and am seeing it still in my 2014 fwiw.
The average "sweet spot" for highway MPG on most early to mid-1970s cars was around 60 to 62 mph. I've heard rumors over the years that the principal reason 55 was chosen instead of 60 for the NMSL was for PR reasons - anyone remember the old jingle "Stay Alive - Drive 55"?

By the 1980s, however, engine technology had been improved to the point that the average MPG "sweet spot" was now around 65 to 70 mph. The mid 1990s saw the MPG "sweet spot" increase again, now to around 70 to 75 mph.

My personal experience with cars I've driven over the years tends to reflect this. While I am considered by relatives and friends to be a conservative driver, I am by no means a "granny" at the wheel, especially when I'm on the Interstate. Until 1987, I drove my parent's cars (large mid-1970s GM road behemoths), and found the best highway mileage to be about 58 mph. My 1984 Tempo's MPG "sweet spot" was about 66 mph, whereas my 1989 Prelude and my 1999 Contour got their best highway mileage at about 70 mph. My 2012 Focus SE's MPG "sweet spot" is about 73 mph. (all the prior cars mentioned had automatic transmission, and the 2012 Focus has the DCT).
02-27-2015 10:53 AM
Young_And_Focus I have observed better fuel economy at 120 than 110, 120 is about 70 mph
02-20-2015 11:09 AM
FordFan1265 This 55 MPH saves you gas "fact" is bull with some cars.

I pay attention to my avg MPG in my 3rd gen Focus and I get my best in-city mileage at 45 MPH, and my best highway mileage around 70 MPH (72 to be exact).

When I actually lock in the cruise control at the 60 MPH speed limit my avg MPG actually levels out at about 0.2 MPG lower than if I lock it in at 72. And if I slow it down to 55 my MPG lingers around 0.3 MPG lower than at 70.

This may be due to the shift points and RPM's involved with the DCT. It may be something with the aerodynamics of the newer Focus at higher speeds. It may be highly dependent on outside temperature and road conditions. A lot might be factoring in... All i know is that my best MPG's are seen at 45 and 72...

This MPG trend was observed in my 2012 and am seeing it still in my 2014 fwiw.
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