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Best Highway Cruising Speed for MPG's

MPG Highway

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67 replies to this topic

#61 OFFLINE   Kelleytoons

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Posted 02 February 2015 - 06:42 PM

+1 (and ScubaDad).  My feelings exactly -- I just love driving it and the FE is a sweet bonus.


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#62 OFFLINE   SPL Tech

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Posted 04 February 2015 - 03:35 AM

I am easily getting over 40 MPG in city driving (hand calculated), yet when taking long Texas highway road trips when I must push 75 mph I only get 34.5 on the average. I have been trying to find a -magic- highway speed to get to my appointments on time and not waste efficiency. I don't seem to have found the sweet spot on this. I am in Texas Hill country primarily making continuous ups and downs and running lots of A/C lately. I have tried 68 MPH which seems to push me up to around 36.5 to 37 MPG's. I will also 'pedal shift' the car into e-mode on downhills, but I can get sloppy on this on 6 hour trips.
Anyone got a compromise speed they've found to get somewhere relatively fast. I cannot drive 55 MPH, I know this is where this vehicle shines, some places I drive out here the speed limit is 80... The semi-trucks are doing all of that.
Thanks

Aerodynamic drag increases as the square of velocity, and the fuel consumption increases exponentially in a trackable fashion. There is no "sweet spot." Your MPGs will decrease in an exponential manner as the speed increases, and you can track this over a chart quite easily. There is no special key you're missing here, you just need to trade MPG for time to the extent you feel appropriate. As the speed increases, the MPG will decrease in a very predictable and calculable manner.

 

And no the vehicle does not shine at 55 MPH. The most fuel-efficient speed of any vehicle is probably around 15-25 MPH. You could probably get over 65 MPG at that speed. From there, as the speed increases the drag increases as the square of the speed increase, just like I said in the first sentence.


Edited by SPL Tech, 04 February 2015 - 03:41 AM.


#63 OFFLINE   wb8nbs

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Posted 04 February 2015 - 11:55 AM

The most PRACTICAL fuel efficient speed is whatever is required to get your transmission to shift into overdrive. On my 09 Focus that was about 42 MPH.



#64 OFFLINE   ptjones

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Posted 04 February 2015 - 02:44 PM

Using A/C can hurt your MPG's 2-3mpg or more. With temps 70-80's I have been able to 47mpg on the I-10 FWY with my aero mods and some drafting. I take advantage of P&G when I can too. At 55mph I can get around 55mpg and 40mph around 70mpg.  At 30mph should get about 80mpg and going any slower gets to be time prohibitive.

 

The most PRACTICAL fuel efficient speed is whatever is required to get your transmission to shift into overdrive. On my 09 Focus that was about 42 MPH.

CMAX uses CVT(continuous variable transmission) so there is no over drive. You do want to be in high gear and not low. :)

 

Paul 


Edited by ptjones, 04 February 2015 - 02:44 PM.


#65 OFFLINE   SnowStorm

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Posted 04 February 2015 - 10:36 PM

.... There is no "sweet spot." ....

 

And no the vehicle does not shine at 55 MPH. ...

I tend to agree about the "sweet spot" - but of course you must define it first:

  1. Most "optimum" compromise between MPG and MPH - totally personal - define any value you like.
  2. A "magical" speed where either speeding up or slowing down results in lower mileage.  This is the one we don't buy.
  3. A "discontinuity" in the MPG versus MPH graph where an increase in speed causes a larger than expected decrease in MPG due to the hybrid system switching modes (see below).  If this happens, one might define the "sweet spot" as being just below that speed.

For #3 above, I'm thinking of the speed where the car stops going in and out of EV and the ICE stays on.  I drive a lot of Interstate with "rolling hills" and at 65 MPH the car uses EV quite often.  But at 70 MPH the ICE is on almost all the time.  My impression is that the drop in mileage from 65 to 70 is larger than you would expect - but I have no real data.  On a flat road my car will just barely keep ICE on constantly at 55 MPH (using cruise control).  At 50 MPH I expect it would constantly go in/out of EV.  Does anyone have any good data or other impressions?

 

As SPL says, you can get far better mileage below 55 MPH.  I have a "test course" I've run a couple of times at about 35 to 40 MPH where I get over 70 MPG returning to the same point and the same SOC on HVB.

 

BTW, hills can be your friend - see this post.


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#66 OFFLINE   cheezy

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Posted 12 July 2015 - 09:36 AM

Several factors are in OUR control, start there; higher tire pressures on eco-tires, quality synthetic oils at just the halfway fill mark on the stick, and ethanol free gasoline will give you an extra 10% with MANY added benefits of NOT having corn in your fuel system.

 

 

http://pure-gas.org/...sp?stateprov=FL

 

Forst, locate your ethanol free stations, then find the one that gouges the least. Here in WI we've found the Cenex stores to be the best.

 

Tires; IIRC we have Michelin Defenders on the Prius from Discount Tire, it's a 90K mile tire with a decent warranty/guarantee. Get on their e-mail list for sales and you can grab a set with an $80-100, rebate card, free 6 mo. financing, 5K tire rotations are gratis. 

 

Otherwise, it sound like EcoCruise at about 67 mph...Cool.  A good wax job too. And a white one, cuz they're faster.  



#67 OFFLINE   Telesrjyje

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Posted 01 October 2017 - 05:53 AM

I have an 06 powerstroke that I want to slowly add some power to. I know I have to open up the exhaust a bit so she can breathe. But ebeing from CA, we have smog to deal with now. What is a good exhaust system for my truck that is still smog legal. I know I can do a cat delete, but I was thinking turbo back. Do I get one that gets rid of the muffler? Can I still smog with no muffler? Thanks Dima

#68 OFFLINE   ptjones

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Posted 01 October 2017 - 10:52 AM

On my PowerStroke 2006 I put on Airaid air filter system and Hyperteck programmer on second setting and got up to 21.5 mpg going 65-70 mph.  Averaged 20+ on the HWY. :)

 

Paul








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