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Used cruise control on a road trip and my mpg got worse

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  #21  
Old 03-28-2018, 10:07 AM
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Originally Posted by kenchan
how fast were you going? if over 65mph it can get worse mpg. i was easily getting 42mpg+ while on my commute at max 60mph..
I didn't go above 60 the whole time on cruise control. I always have my A/C on low so this shouldn't have really affected anything. Just weird how everything I read online said cruise control saves on gas but in my situation it did the opposite. Not a huge drop in mpg but still weird that it hasn't gotten under 37 mpg since I bought it and the one time I use cruise control it drops. It's back up to 37 mpg right now just doing my regular commutes without cruise control.
 

Last edited by Pumpkintacos; 03-28-2018 at 10:09 AM.
  #22  
Old 03-28-2018, 10:20 AM
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Everyone I know who cares about fuel economy knows that cruise control makes it worse.

In a shocking twist, websites that don't cater specifically to fuel economy dorks are wrong.

(The shocking twist bit is sarcasm)
 
  #23  
Old 03-29-2018, 01:58 AM
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They taught that in Physics class. 'Conservation of Energy' I think ;=)
 
  #24  
Old 03-29-2018, 07:59 AM
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I don't really think the point is about cruise control or not.
If there is a questionable element it's city driving vs. highway driving. It's a little strange that on a extended highway drive the MPG did not increase.

Cruise Control or not, if I'm on the freeway with The Fit for more than 15 minutes, my MPG goes up. If it's a long road trip, usually pretty significantly.

But a 1 time event? Where the MPG really stay about the same? I wouldn't worry about.

If it was me?
I'd pick a day off, fill the tank and reset the trip computer, then go on a highway drive, and see what the MPG becomes.

Your gas mileage should increase. EPA estimates for The Fit, have it being 33 city, 40 highway. So yes, there should be an increase. Especially, if the OP was keeping the freeway speeds "modest".

But again? At this point, results from 1 road trip? I wouldn't worry. Especially if the MPG is returning to "combined" driving norm.
 
  #25  
Old 03-29-2018, 08:16 AM
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Maybe I need my first oil change already, it's at 20% oil right now.
 
  #26  
Old 03-29-2018, 11:08 AM
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I'm not too sure if the fits cruise control use the brakes but on my Beamer The Cruise uses brake so he's it's always constantly breaking when it's little bit over the MCP speed it does not have a coast feature like my old Focus RS did. Since we are using brake if it's going on a downhill and not coasting you're using More fuel.
 
  #27  
Old 03-29-2018, 11:27 AM
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Fit doesn't seem to slow you down on cruise if you go down a hill, it's more like it doesn't apply gas till it needs to.

CC really ramps up the RPM when going up a hill, more than it really needs to. I never liked that feature and that's why I don't typically use CC any more. I can modulate the gas better for better fuel economy.
 
  #28  
Old 04-01-2018, 06:48 PM
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My matinence minder turned on today, A1, time for my Fit's first matinence.
 
  #29  
Old 04-01-2018, 10:29 PM
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Originally Posted by Pumpkintacos
My matinence minder turned on today, A1, time for my Fit's first matinence.
Make sure they don't overfill your oil when changing it. Check it before you leave the dealership.
2 maintenance cycles for my Fit...two overfilled Oil Changes. Learning the hard way.
 

Last edited by fitchet; 04-02-2018 at 06:07 PM.
  #30  
Old 04-02-2018, 08:02 AM
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what did you do to control all the variables? I also found wind affects mpg a lot.
 

Last edited by wasserball; 04-02-2018 at 09:41 PM.
  #31  
Old 04-02-2018, 01:01 PM
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Originally Posted by 2Rismo2
Fit doesn't seem to slow you down on cruise if you go down a hill, it's more like it doesn't apply gas till it needs to.

CC really ramps up the RPM when going up a hill, more than it really needs to. I never liked that feature and that's why I don't typically use CC any more. I can modulate the gas better for better fuel economy.
That’s the thing. When I’m controlling the car, I can take advantage of downhills to gain speed and allow my speed to drop a bit on uphills, conserving momentum and fuel. Cruise control can’t anticipate grades and is only concerned with maintaining a steady speed so it’s not surprising that it’s not as efficient.

Also, don’t discount the effects of headwinds and tailwinds on fuel economy. I find that the Fit is very susceptible to mileage variation on the highway depending on the direction of the wind. To get a really accurate mileage reading it should, therefore, be on an “out and back” trip to minimize the effects of wind resistance or done on a calm day.
 
  #32  
Old 04-02-2018, 05:33 PM
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To be technical, comparing two out-and-back trips isn't that accurate either, unless the wind speed and direction are pretty close. You lose more mileage fighting a headwind than you pick up with a tailwind. So the windier trip will consume more fuel, all other things being equal.
 
  #33  
Old 04-02-2018, 08:10 PM
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Originally Posted by Brain Champagne
To be technical, comparing two out-and-back trips isn't that accurate either, unless the wind speed and direction are pretty close. You lose more mileage fighting a headwind than you pick up with a tailwind. So the windier trip will consume more fuel, all other things being equal.
Being a bicyclist, I know that very well. Also, for every uphill there will be a downhill, but there isn’t a tailwind for every headwind.
 
  #34  
Old 04-02-2018, 08:30 PM
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The lessons here are that there are many variables and a drop of 0.3 mpg is statistically insignificant.
 
  #35  
Old 04-02-2018, 08:34 PM
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Yeah, and crosswinds add resistance in both directions.
 
  #36  
Old 04-09-2018, 11:45 AM
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Originally Posted by fitchet
Make sure they don't overfill your oil when changing it. Check it before you leave the dealership.
2 maintenance cycles for my Fit...two overfilled Oil Changes. Learning the hard way.
I saw your thread about that, what a freaking mess.

Just got back from the dealership, everything went fine, oil is at 100%. I requested no car wash (even though my car is already scratched to shit mysteriously). I was surprised that I didn't have to pay anything...I know other dealerships give you a free oil change but I thought Honda didn't do that. In fact I remember specifically asking if the first oil change was free and I was told not unless I bought a maintenance package or something.
 
  #37  
Old 04-09-2018, 12:35 PM
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Check your splash shield...
 
  #38  
Old 04-09-2018, 12:47 PM
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Originally Posted by 2Rismo2
Check your splash shield...
Check it for what...
 
  #39  
Old 04-09-2018, 01:39 PM
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To make sure it's attached correctly. Otherwise it could fall off...
 
  #40  
Old 04-10-2018, 07:30 PM
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Originally Posted by 2Rismo2
To make sure it's attached correctly. Otherwise it could fall off...
So far so good
 
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