Engine Load/Ultragauge - Page 2 - Fiberglass RV


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Old 08-01-2012, 01:08 PM   #15
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I think you have to treat the instantaneous mpg figure with caution, whether from a dash readout or an OBD device. Drivers will concentrate on getting a 'good' number from the readout which may not be good for economy.

For example, very slow acceleration that gives the highest mpg figure is, despite everyone's gut feeling, not the most economical way to accelerate. Best practice is to use wide-open throttle at medium revs (around peak torque) as then the engine is then working at maximum efficiency. It's like removing a band-aid - a short sharp pull hurts less than a long slow reticent one. If you want confirmation, look at economy competitions where 'coast and burn' techniques (maximum acceleration followed by coasting with engine off) give the best results - not a good idea for road driving!

Similarly the best mpg reading is obtained when doing the single most uneconomical thing in driving - using the brakes.
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Old 08-01-2012, 02:19 PM   #16
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Andrew,

I don't understand how using the brakes gives the best mpg. Best mpg for me is rolling, to the stop sign or down hill in neutral, particularly asy with a manual transmission. I like see instantaneous mpg but focus on engine load. Maximizing energy to me is reduce percentage of engine load. As you suggest keeping the engine in its most efficient range is important. For us it seems to be between 3000 and 3500 RPM.

I really should take a look at the engine power curve.
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Old 08-01-2012, 02:24 PM   #17
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When trying to get the best fuel mileage, steady smooth driving with moderate throttle is ushually where you will get the best result, most fuel injected vehicles when the control module sees " wide open throttle" pretty much poors as much fuel into the engine as it can get, generally resulting in aproximatly 5 ish to 1 fuel mixture, the peek ration is 14 ish to 1.
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Old 10-14-2013, 09:40 PM   #18
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lUlgragauge

Got your message, thanks. I will be ordering soon. Sounds like that little gauge would help everyone. Marg in NW California
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Old 10-15-2013, 10:57 AM   #19
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I've used a ScanGauge for a number of years, and really like it. Since getting a trailer heavier than the old pop-up, I added Transmission Temperature, and found that pretty helpful. In spite of having a transmission cooler on my Tacoma, one can really see the swings in temp. My standard gauge uses are engin temp, tran temp, MPG, and speed. Speed is interesting because at higher speeds it differs substantially from the vehicle's speedometer (also electronic). I've checked both with a GPS and found the ScanGauge to be the more accurate.
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Old 10-15-2013, 01:49 PM   #20
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I didn't like it due to the size (Small) and thought it was distracting. Taking eyes off the road while driving. Just Sayin
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Old 10-15-2013, 02:37 PM   #21
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Every vehicle is different. When towing my Bigfoot with my Tundra I get the best mileage by keeping the RPMs low, at or below 1,500 RPM ideally, and definitely below 1,800 RPM whenever possible. Basically "lugging" it. Unfortunately, this is also not the easiest way to drive while towing. It wants to "hunt" a lot, especially on even a slight upgrade or in a head wind. Tundra's with the factory tow package have a user-selectable Tow/Haul mode, which basically raises the shift points allowing more use of the peak area of the torque curve. I find this the most pleasant mode to drive in while towing, but it always results in a significant hit in fuel mileage. The key is to experiment with your vehicle using different driving strategies until you find what works best for your TV/trailer combination.
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Old 10-15-2013, 03:10 PM   #22
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Placement is important in order to keep your eyes on the road. In the case of my last two Tacomas, the ScanGauge sets right on top of the steering column and in the sight line of the speedometer. It's no different than looking at any of the other gauges.
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Old 10-15-2013, 03:36 PM   #23
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My Ultra gauge sets at the bottom of the gauge window between the MPH gauge and ROM gauge. It blocks nothing and is in a spot I normally look at while driving. To me it's size is a feature.
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Old 10-15-2013, 05:58 PM   #24
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Originally Posted by Andrew Gibbens View Post

Similarly the best mpg reading is obtained when doing the single most uneconomical thing in driving - using the brakes.
My Escape has current "Economy" display as one of it's choices and yes getting off the gas and on the brakes makes the bar move toward high economy.

From the engines standpoint when I brake I'm coasting and it's the engine being read by the gauge.

I would think the % Engine Load would be useful measure, different engines have different speeds/rpm range where they are most efficient. Finding that spot would be easier with a guage than it is to drive at specific speeds for long enough to get mpg readings for each. And when the terrain changes the "best" speed may well be different.

I do a highway commute of about 25 miles, so I am able to spend a week driving the same route at a specific speed to "find" the speed that yields the best mpg for my daily commute. That speed is different in my 4 cyl Pontiac than it was in my 4 cyl Accord, and is different still in my wifes V6 Escape.
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Old 10-15-2013, 07:48 PM   #25
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Looks like they are running a sale price, right now might be a good time to buy one.
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