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Discussion Boards > Active Subjects > Messages as Posted > Car Tires and Maintenance Forum

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05-19-2010, 14:47

Post: 170923

greg_g

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Join Date: Jan 2004
Location: Western Kentucky
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

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Car Fuel Economy and the 55 MPH speed limit

Quote:

Originally Posted by DennisCTB | view 170914

Saying that going 55 versus 65 to 75 saves 20% on fuel.

Not in my car. Mercedes designed their cars to get the best fuel economy at the most commonly traveled speeds. I have a 2006 E320 CDI (diesel) that gets >39mpg at 75mph, cruise control and A/C on. But on secondary roads where I have to keep it down under 60mph, I can't do better than 35mpg.

Driving on freeways only - I easily can make it to my daughters house in MN on less than a (21g) tank, elapsed time about 10.5 hours. But taking 55 mph secondary roads, I'd have to stop once for fuel. And the trip would probably take at least 14 hours.

Do I want to return to a national 55 mph limit? HELL NO !!

//greg//

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05-27-2010, 12:38

Post: 171135

greg_g

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Car Fuel Economy and the 55 MPH speed limit

Quote:

Originally Posted by Murf | view 171124

I my car and both SUV's are designed for optimum mileage at 70-85 mph and my plane gets it's best economy at 160 mph.

My point exactly !! My 85 Mercedes does in fact get better mileage at 55 mph than at 75, cuz it was engineered from the git-go to drive under the then-current 55 mph restrictions. But my 2006 Mercedes is the other way around. What these short sighted politicians miss, is that cars made since 1995 would start delivering poorer performance and economy, if forced to be driven outside their design parameters.

And I doubt the pols would write a provision into the bill to pay ECM reprogramming costs to optimize post-1995 vehicles performance and economy at 55 mph.

//greg//

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