{"id":37214,"date":"2018-12-23T06:00:49","date_gmt":"2018-12-22T21:00:49","guid":{"rendered":"https:\/\/www.panamera-life.com\/?p=37214"},"modified":"2021-07-29T15:58:59","modified_gmt":"2021-07-29T06:58:59","slug":"come-and-go-acc","status":"publish","type":"post","link":"https:\/\/www.panamera-life.com\/en\/entry\/come-and-go-acc\/","title":{"rendered":"Testing Porsche Panamera on the Highway \u2013 Does ACC (Adaptive Cruise Control) Really Improve Fuel Efficiency?"},"content":{"rendered":"

Driving the Panamera on the Highway<\/h3>\n

The other day, I had some errands in Nagoya on a weekday, so I decided to drive my Panamera from home to Nagoya using the highway<\/strong>. However, since I had the impression that the Meishin and Shin-Meishin Expressways are often crowded with trucks and cars, I thought, “Maybe it would be easier to drive using ACC (Adaptive Cruise Control) the whole way.”<\/strong><\/p>\n

Since I was at it, I thought it might be interesting to “drive normally on the way there, then use ACC on the way back, and compare the fuel efficiency.”<\/strong> It’s commonly said that ACC, which keeps the accelerator steady, generally improves fuel economy, but I wondered how true that really is.<\/p>\n

That said, the uphill and downhill sections on the outbound and return routes differ slightly, so it won\u2019t be a perfectly accurate comparison… but I figured it was worth a try.<\/p>\n

First, driving myself<\/h3>\n

When I set the navigation for the outbound trip, the fastest route\u2014taking about two and a half hours\u2014was “Meishin Expressway \u2192 Shin-Meishin Expressway \u2192 Higashi-Meihan Expressway \u2192 Nagoya Expressway Ring Route.”<\/strong> So I took that route.<\/p>\n

\"\"<\/p>\n

For this drive, I focused on:<\/p>\n

\u30fbCruising at a steady speed without speeding or braking unnecessarily
\n\u30fbStaying in the driving lane when traffic was light, and overtaking with gentle acceleration<\/p>\n

(Well, that\u2019s obvious, but I hadn\u2019t really been conscious of it before.)<\/span><\/p>\n

I set off, but the local roads from home to the Meishin Expressway were always congested, which hurt the fuel efficiency quite a bit. However, once on the highway, the drive was relatively smooth. I didn\u2019t take any breaks and arrived in Nagoya in just under two and a half hours as planned.<\/p>\n

\"\"<\/p>\n

At this point, the fuel consumption read \u201c8.3L\/100km (my husband always sets it to European units)<\/span>,\u201d which means about 12 km\/L<\/strong>.<\/p>\n

That\u2019s really good!<\/span><\/p>\n

Usually, on long trips in the Panamera, fuel efficiency tends to be between 9.0 and 10 km\/L, so this was quite impressive. After arriving in Nagoya, I had a bit of trouble finding parking near my destination but eventually found an indoor underground garage and parked the car.<\/p>\n

…But I completely forgot to take a photo of the fuel gauge before turning off the engine and heading upstairs. Too late.<\/p>\n

Oops… (\uff1b\uff9f\u0414\uff9f)<\/span>(Lost the proof…)<\/span><\/p>\n

I only remember the fuel consumption, so I don\u2019t know the average speed, but I\u2019m pretty sure it stayed at 8.3L\/100km until the end.<\/p>\n

\"\"<\/p>\n

Now, heading home with ACC<\/h3>\n

After finishing my errands, I set the same route for the return trip and set off. Traffic wasn\u2019t too heavy, but there were quite a few cars. I thought, “This is definitely a job for ACC.”<\/strong> As I just held the wheel without doing much else, a strong wave of sleepiness hit me after about an hour and a half, so I stopped at Otsu SA for a short break.<\/p>\n

Even with ACC, you can\u2019t just fall asleep… (-_-)<\/p>\n

\"\"<\/p>\n

Also, I completely forgot to buy souvenirs for the kids in Nagoya, so I went inside to look around\u2014and to my surprise, among the Kyoto and Shiga souvenirs, there were actually some Nagoya souvenirs!<\/strong> Phew.<\/p>\n

After buying the souvenirs, I continued the journey home.<\/p>\n

The section near Kyoto Higashi narrowed to two lanes and got a bit congested, but after passing Kyoto Minami, it opened to three lanes and traffic flowed smoothly. However, near the Nishinomiya IC on the Meishin Expressway, there was lane restriction and traffic came to a complete stop, crawling along slowly.<\/p>\n

\"\"<\/p>\n

At times like this, ACC really proves its worth. Fortunately, the traffic jam wasn\u2019t too long, and I arrived near home safely. Actually, the uphill slope right in front of my house is quite steep, and fuel efficiency usually drops by 0.2 to 0.3 there, so I stopped measuring fuel consumption before that. The fuel stats were:<\/p>\n

Average fuel consumption: 8.5L\/100km (11.7 km\/L)
\nDriving time: 2:39 hours
\nDistance: 185 km
\nAverage speed: 72 km\/h<\/p>\n

\"\"<\/p>\n

Is ACC really better for fuel efficiency?<\/h3>\n

This was my first long-distance drive using ACC, and I was left with the strong impression that \u201cwhen the car ahead disappears, it immediately tries to close the gap by accelerating hard.\u201d When I drive myself, even if the car ahead disappears, I often think, “If I keep this pace, I\u2019ll catch up to the car in front soon enough, so I\u2019ll just cruise,”<\/strong> and don\u2019t accelerate unnecessarily. But ACC accelerates and then brakes again when it detects a leading vehicle.<\/p>\n

Despite that, the fuel efficiency wasn\u2019t much different from when I drove myself, and considering there was some traffic on the way back, this fuel consumption suggests that ACC drives in a car-friendly way. Above all, it\u2019s much easier when traffic is heavy.<\/p>\n

That said, driving about 370 km and 5 hours round-trip while constantly worrying about fuel efficiency wasn\u2019t very enjoyable,<\/strong> so I realized again that when I\u2019m in the Panamera, I\u2019d rather just enjoy driving without overthinking it.<\/p>\n","protected":false},"excerpt":{"rendered":"Driving the Panamera on the Highway The other day, I had some errands in Nagoya on a weekday, so I decided to drive my Panamera from home to Nagoya using the highway. 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