Go Back   Club Lexus Forums > General Forums > Car Chat
Sign in using an external account
Register Forgot Password?

Fuel savings between 55 mph and 75 mph

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 07-03-13, 11:21 AM   #1
PhilipMSPT
Cycle Savant
Trader Score: (5)
 
PhilipMSPT's Avatar
 
Join Date: Jul 2005
Location: In rehab...
Posts: 20,962
Default Fuel savings between 55 mph and 75 mph

The penalty for speeding: A loss in fuel economy

By Consumer Reports News | ConsumerReports.org

Yahoo News Link

Click the image to open in full size.


Quote:
You know that driving at 75 mph rather than 55 wastes gas, but how much? We did the math, driving a steady 55, 65, and 75 mph in a Honda Accord, a Toyota RAV4, and three versions of a Ford Fusion. The penalty for speeding, even in those relatively fuel efficient cars: a loss of up to 14 mpg.

True, driving 200 miles at 75 instead of 55 shaves an hour off your trip. But in the cars we used, it also wastes 1Ĺ to 2 gallons and costs about $5 to $7. For every thousand miles at 75 mph, you're increasing carbon footprint by 7 to 10 gallons and throwing away about $30.

Need more motivation? High speeds increase the likelihood of a crash and slash the odds of surviving one, says the Insurance Institute for Highway Safety.

Other gas-saving tips. Drive smoothly when possible, avoiding hard acceleration and hard braking. Combine short trips to avoid driving with a cold engine, and keep tires properly inflated. Turn the car off if it will be idling for more than about 30 seconds.

HTML Code:
Model	                55 mph	65 mph	75 mph	mpg% drop between 55-75
Honda Accord LX 4-cyl.	49 mpg	42 mpg	35 mpg	29%
Ford Fusion Hybrid	49	41	36	27%
Ford Fusion 1.6 4-cyl.	41	36	30	27%
Ford Fusion 2.0 4-cyl.	41	34	28	32%
Toyota RAV4	        37	33	27	27%
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
__________________
TLN # CDXLVIII, Supreme Chief Justice
"99 percent of people would soil themselves on it in 1st gear. Thatís why most people drive cars." -- HFL

Lexus (you know...), Ducati Multistrada 1200, Harley Davidson Muscle Rod
PhilipMSPT is offline   Reply With Quote
Old 07-03-13, 11:34 AM   #2
TangoRed
Lexus Test Driver
Trader Score: (0)
 
Join Date: Nov 2006
Location: Georgia
Posts: 1,304
Default

No surprises there. These eco-conscious cars are all very speed-sensitive when it comes to hitting their mileage ratings. For me, at this point in life, time is money though and right now it makes sense to continue driving 75mph.
TangoRed is online now   Reply With Quote
Old 07-03-13, 12:09 PM   #3
MPLexus301
Lexus Fanatic
Trader Score: (3)
 
MPLexus301's Avatar
 
Join Date: Jun 2004
Location: Atlanta, Georgia
Posts: 8,944
Send a message via AIM to MPLexus301
Default

Wow...the 4cyl Accord eeked out a lead over the Fusion hybrid. Impressive. The 55 and 65 mph numbers for all of these cars are really awesome.
MPLexus301 is offline   Reply With Quote
Old 07-03-13, 12:12 PM   #4
Infra
Lexus Test Driver
Trader Score: (1)
 
Join Date: Jun 2006
Location: TX
Posts: 1,016
Default

So for everyone 1,000 miles I drive, I can buy 5 hours of time for only $30?

Sounds like a no-brainer for me. Even @ US federal minimum wage this is pretty much a good way to spend your money money.

Last edited by Infra; 07-03-13 at 12:18 PM..
Infra is offline   Reply With Quote
Old 07-03-13, 01:07 PM   #5
ntran18
Lexus Test Driver
Trader Score: (27)
 
ntran18's Avatar
 
Join Date: Apr 2004
Location: sOCal
Posts: 1,080
Send a message via AIM to ntran18
Default

Quote:
Originally Posted by Infra View Post
So for everyone 1,000 miles I drive, I can buy 5 hours of time for only $30?

Sounds like a no-brainer for me. Even @ US federal minimum wage this is pretty much a good way to spend your money money.
Provided that it is safe & reasonable to do so.
ntran18 is offline   Reply With Quote
Old 07-03-13, 01:23 PM   #6
gengar
Moderator: LFA, Clubhouse
Trader Score: (0)
 
Join Date: Nov 2007
Location: NV
Posts: 4,193
Default

How about a study from Consumer Reports about how much mpg we lose due to overcrowded highways and traffic during rush hours, as a result of utter government incompetence in allocation of public resources?

BTW, in the IS F, I only see a 6-10% difference in mpg between 65 and 75 (I've never bothered driving at 55mph). The 8 gears probably helps relative to the case studies here.


Quote:
Originally Posted by TangoRed View Post
No surprises there. These eco-conscious cars are all very speed-sensitive when it comes to hitting their mileage ratings. For me, at this point in life, time is money though and right now it makes sense to continue driving 75mph.
Yep. Heck, on the massive interstates, I'd go 100mph if they'd let me.

Last edited by gengar; 07-03-13 at 01:28 PM..
gengar is offline   Reply With Quote
Old 07-03-13, 01:47 PM   #7
Sulu
Lead Lap
Trader Score: (0)
 
Join Date: Feb 2011
Location: Canada
Posts: 673
Default

This is to be expected with normal automatic or manual transmissions in top gear. The engine will be turning faster at 75mph than 55mph, so it will be using that much more fuel also.

But with a continuously-variable transmission (CVT) (or transmissions with a great number of gear ratios, such as 8- or 9- or 10-speed transmissions) -- assuming it has a great enough gear ratio difference to allow the engine to be turning over at the same RPM at 75mph as at 55mph -- the fuel consumption should theoretically be the same at the two speeds; any differences would be due to increased drag at the higher speed (and I don't know how much effect that will have on fuel consumption).

Does the tested Accord have a CVT? If so, is the gear ratio range great enough to allow for "normal" engine speeds as high as 75mph?
Sulu is offline   Reply With Quote
Old 07-03-13, 02:23 PM   #8
SteVTEC
Lexus Test Driver
Trader Score: (0)
 
SteVTEC's Avatar
 
Join Date: Mar 2003
Location: Maryland
Posts: 1,246
Default

Aerodynamic drag becomes extremely significant and increases exponentially above 55 mph and especially all the way up to 75 mph. As for the Accord beating out the Fusion Hybrid, remember this is a straight highway driving test and has no city component, so of course the Fusion Hybrid would still clean a non-hybrid's clock there.
__________________
Steve

12 BMW E70 X5d (IT'S HERE!)
11 BMW E93 335i convertible (the Bavarian | pics)
02 Highlander Ltd V6 AWD (the beloved)
SteVTEC is offline   Reply With Quote
Old 07-03-13, 02:23 PM
 
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
All New 2013 Ford Fusion Hybrid to Get 47-48 City MPG GS69 Car Chat 30 12-19-14 12:51 PM
Car and Driver: 2013 Ford Fusion Energi Titanium vs. 2014 Honda Accord Plug-In Hybrid Hoovey2411 Car Chat 4 03-09-14 11:30 AM
2013 Toyota RAV4 XLE Sulu Car Chat 22 05-15-13 07:32 PM
Review: 2010 Ford Fusion Hybrid mmarshall Car Chat 55 06-20-09 09:18 AM
The $28K 2010 Ford Fusion Hybrid That Won't "Shudder" Like a $107K Lexus LS 600hL Mpunk Car Chat 29 02-11-09 07:13 PM


Tags
2006, 55, 55mph, 75, burn, club, driving, gas, lexus, mph, sign

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 07:21 PM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info