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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCoasting function
Leading reported evidence
Reset mpg meter at a gas station
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Performed · outcome unconfirmed
I reset the MPG meter at a gas station after the car was warmed up.
Leading evidence: 'Reset mpg meter at a gas station' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace of speed limit ahead' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
For example, you may want to slow down 62 mph to 50 mph in anticipation of the change of speed limit ahead.
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Suggestion
If traveling in the mountains or the red reserve light is on, I might use the auto stop.
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Suggestion
When I am mindlessly droning along the Interstate I will use the coasting function.
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Suggestion
Guys, For long road trips, which is actually more fuel efficient, coasting or using cruise control?
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19 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Planet-9: 1 discussions
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Generation: 20261026T213932Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I don't like the start/stop function but I do appreciate the coasting feature.
The coasting function is not possible when start/stop is deactivated.
So instead can I just put the car in neutral when I want to coast? I have a
PDK
Sent from my
iPhone
using Tapatalk
Putting it in neutral is not similar to coasting as you'll lose momentum overtime... that's what I read somewhere. For me, the function will stay off for stop/start and coasting. I'm not interested to try this feature.
So much easier just to activate start stop function (and therefore coasting mode) when driving and deactivate when coming to a halt. It's just one push of a button on the centre console....
I wasn't sure about the start/stop and the coasting functions. However, yesterday I went on a 140 mile trip and I used them both. I took two-lane roads to my destination (with a lot of driving through small towns) and I came back on the interstate. I averaged 33 miles to the gallon. This is a new car that isn't broken in yet and I got 33 miles to the gallon! I was impressed.
If I am out to have fun I will put my car in "sport" and not worry about fuel mileage but if I am just driving around I will see what kind of mileage I can get. :cheers:
I got a whole 38 MPG on a 50ish MPH highway trip before thanks to nice weather, the coasting feature, and being stuck behind a train of cars following grandma. I reset the MPG meter at a gas station after the car was warmed up.
According to
Porsche
, coasting is much like putting the car in neutral. From the
Porsche
website we read -
"Coasting
The coasting function available with Porsche Doppelkupplung (PDK) enables you to save even more fuel where the situation allows. The engine is decoupled from the transmission to prevent deceleration caused by engine braking. In this way, optimum use is made of the vehicle’s momentum, allowing it to coast for longer distances.
For example, you may want to slow down 62 mph to 50 mph in anticipation of the change of speed limit ahead. As you ease off the accelerator pedal, PDK deselects the current gear automatically and you begin to coast in neutral until you have reached your desired speed. As soon as you operate the accelerator or brake pedal, PDK re-engages the appropriate gear within fractions of a second. The process is smooth and seamless thanks to the extremely fast clutch.
Another way to reduce fuel consumption is to utilize the coasting function on downhill gradients that are gentle enough for you to maintain a constant speed. Efficient on long journeys, such as on the highway, PDK remains ready to respond as swiftly and precisely as you would expect.
In short, driving in coasting mode makes a real impact on fuel consumption without any need for compromise on comfort or sporty performance."
In my most states, it is illegal to have your car in motion without the drivetrain engaged, i.e. holding the clutch in or putting the car in neutral. Was actually stopped for speeding down a large hill in PA one time and the officer asked if I had put the truck in neutral since he saw my speed increase. He then told me about how that is illegal and I could be ticketed for it. Not sure how the law would apply to the
Porsche
"Coasting" feature as it does allow for instant gear engagement.
You can look it up online for your state to see if they have such a law. My stop was made by observation from the officer on a large highway down hill.
Unlike physically moving your transmission from "Drive" to "Neutral" the coasting function is seamless. You don't have to think about it.
When I am mindlessly droning along the Interstate I will use the coasting function. The Interstate is boring anyway. I might as well save some fuel while I am driving it.
If traveling in the mountains or the red reserve light is on, I might use the auto stop. Otherwise I like engine braking, and I hate engine auto stop. The only part of it I like is the auto start if I stall it, and I get that with it turned off.
I'm not crazy about the feel of the coasting function. Feels like hesitation when I un coast because the engine has to come up from idle. I wonder about extra wear on the clutches and actuators, too. It is cool for saving fuel, but I'm often on ACC, so don't get to use it. And also always in Sport mode. But I were low on fuel...
Didn't see this mentioned, but on a
pdk
with the paddles, pulling back both paddles simultaneously will put the car in neutral. I do this sometimes to coast and at traffic lights, so my foot isn't resting on the brake.
