Ano po ba talaga ang ibig sabihin pag sinabi nating "city/mixed/highway driving"?

[valacirca]

Parang mahirap lang kasing intindihin yung ibang fuel consumption stats pag sinabi lang halimbawa na "taken while city driving."

Kasi may ibang parts ng city na mabilis at maluwag ang traffic. May iba namang parts ng city na mabagal at masikip ang traffic. Nagbabago din ang traffic conditions sa city based on time of day and weather (kung umuulan o hindi). So hindi naman consistent ang traffic conditions ng "city driving" diba?

Isn't it better to classify fuel consumption/economy readings based heavy/moderate/light traffic?

[Retz]

mdyo subjective nga talaga yan kasi hindi naman lahat ng city ay ma traffic. but majority pag sinabing city driving inclusive na ang traffic.

[_Qwerty_]

hindi din naman pareho pareho yung pagsukat sa heavy/moderate/light traffic.. dapat yung km travelled and how long did it took you.. like 20 kms distance took you 1.5 hours.. so that's only around 14kms per hour for 1.5 hours..

[JohnM]

On top of that iba iba din ang weather conditions and driving style. So kahit sabihin mong same heavy traffic pero kung ang drivers ay si hypermiler vs Mr Freeze may diff pa din.

[niky]

On top of that iba iba din ang weather conditions and driving style. So kahit sabihin mong same heavy traffic pero kung ang drivers ay si hypermiler vs Mr Freeze may diff pa din.

Eh, unrealistic ang assumptions ng mga iba. Sasabihin nila... bakit yung "H" o "K" o "F", 7 km/l lang sa traffic, yung "T" kaya mag 11 km/l.

Pero in reality, 11 km/l yun, Sunday morning. Kung heavy traffic din, mga 7 km/l din.

I've driven them all. And while mga iba, yes, medyo malakas sa gas... hindi naman night and day difference. Minsan, 0.5 km/l to 1 km/l lang difference sa isa't isa.

[JohnM]

Eh, unrealistic ang assumptions ng mga iba. Sasabihin nila... bakit yung "H" o "K" o "F", 7 km/l lang sa traffic, yung "T" kaya mag 11 km/l.

Pero in reality, 11 km/l yun, Sunday morning. Kung heavy traffic din, mga 7 km/l din.

Para kay ermats ang "trafik" may tumawid na kalabaw sa kalsada Kaya di nya maintindihan bakit di ako makarating ng airport from San Juan in 15 mins eh ang lapit lang daw nun :hysterical:

[steer]

dapat siguro magkaroon nalang ng standard testing sa isang open race track.


for example at one hour interval each:


car running at 20 kph gets XX kilometers per liter.

car running at 60 kph gets XX kilometers per liter.

car running at 100 kph gets XX kilometers per liter.

car running at 180 kph gets XX kilometers per liter.


kung ganun gagawin then hindi na ganon ka dependent sa traffic and weather conditions.

[Noel Salisipan]

Isn't it better to classify fuel consumption/economy readings based heavy/moderate/light traffic?

Iki-clasify naman yan ng mga Tsikoter lalo na yung mga skeptic, yung mga mas nakakaintindi, at mas gusto ang detail presentation.

Yung iba naman simple lang ang details, so assume mo na normal driving habit.

Meron din namang binibigay na standard ang mga manufacturer, critics, reviews... Good to start din yun for initial refference.

Finally, it's up to you kung ano mga standard ang gusto mong gamitin!

[niky]

We are proposing for the PCOTY a fuel economy test on the racetrack with a target lap time, sections where you have to hold 60 kmh, sections where you hold 30 kmh, and sections where you stop.

In testing, economy indicated is equal to light traffic, but it is very difficult to do.

Very hard to simulate traffic. Taking slightly longer to stop or start in one car will build up over several laps.

The best way is to do a dyno test instead of an on-road test. This allows you to vary and spedify load, and to control weather conditions.

[111prez]

For me, since I have an MID, I base it on average speed.

This takes care of the issue on whether or not it is city/highway/mixed driving.

It does not however consider uphill or downhill routes.

[jut703]

My take:

City driving - anything inside Metro Manila or any big city in the country

I further dissect it to heavy, moderate, and light:

Heavy - below 15 kph average speed, typically EDSA rush hour traffic

Moderate - 16-19 kph average speed, typically EDSA plus lighter QC traffic

Light - 20-30 kph average speed, typically Sunday driving

Highway driving is expressway driving, plus national highway if it's free flowing (like 10pm onwards)

Mixed driving is a mix of city and highway driving, as the name implies.

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[Altuy]

I further dissect it to heavy, moderate, and light:

Heavy - below 15 kph average speed, typically EDSA rush hour traffic

Moderate - 16-19 kph average speed, typically EDSA plus lighter QC traffic

Light - 20-30 kph average speed, typically Sunday driving

Impressive attention to detail

But yeah... I've also been testing roads to establish thresholds/tiers/speed qualifiers. The last of which is my trip to Laguna last Saturday (morning; around 10 AM). From AFP (Bonny Serrano-EDSA intersection) to Solenad, Nuvali, my average speed was 51 kph (via Eton exit).

[desmosedici]

I think fuel mileage postings in forums like this are of value ONLY IF posters compare the mileage of 2 (or more) cars they own or have recently owned, driven daily on the same general route under the same general traffic conditions over a considerable period. Then the data shared is reliable but only as far as which of the 2 cars involved have better fuel mileage and by how much. Other owners of the same exact cars can then apply such data to compare a 3rd model (and a 4th, 5th and so forth) and a fairly accurate ranking of all 3 cars can be deduced using simple mathematical principles - e.g. if A>B and B>C, then A>C.

There's just too many variables affecting fuel consumption that comparing mileage postings of different cars by different owners is an exercise in futility. The variables include route, traffic conditions, ambient temp, humidity, elevation, aircon settings, number of passengers, cargo load, manner of measuring mileage, tire rolling resistance, driver accelerating and braking styles, accessories used (load on alternator)...I'm sure there's more.

[jut703]

I think fuel mileage postings in forums like this are of value ONLY IF posters compare the mileage of 2 (or more) cars they own or have recently owned, driven daily on the same general route under the same general traffic conditions over a considerable period. Then the data shared is reliable but only as far as which of the 2 cars involved have better fuel mileage and by how much. Other owners of the same exact cars can then apply such data to compare a 3rd model (and a 4th, 5th and so forth) and a fairly accurate ranking of all 3 cars can be deduced using simple mathematical principles - e.g. if A>B and B>C, then A>C.

There's just too many variables affecting fuel consumption that comparing mileage postings of different cars by different owners is an exercise in futility. The variables include route, traffic conditions, ambient temp, humidity, elevation, aircon settings, number of passengers, cargo load, manner of measuring mileage, tire rolling resistance, driver accelerating and braking styles, accessories used (load on alternator)...I'm sure there's more.

Yes, there are many variables involved, with traffic conditions, route, and driving style as the biggest determinants for fuel consumption.

But thay doesn't mean the data is pointless if your conditions aren't met.

For example, the FC of my Mazda 3 is a horrible 4-6 km/L in city driving. My Altis on the other hand did 7-9 km/L in city driving. Both cars are driven on different routes, but the aggregate data shows that when traffic is heavy, the Mazda really goes down to 4-5 km/L while the Altis drops to 7 km/L. If traffic is lighter, the Mazda does 6 km/L while the Altis does over 9 km/L.

The conditions do not have to be exactly the same for numbers to have value. They just have to be measured with consideration of the other variables.

This is why I always put notes on my fill-ups - if it was city/mixed/highway driving, what route, and how hard I was driving at the time. I even include fuel type and brand, but have found that FC is more or less the same regardless of fuel and that the aforementioned factors are more important.

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[desmosedici]

We will have to agree to disagree on the usefulness of individual mileage.

Nway 4 km/liter on a Mazda 3 is just horrible. I daily drove an SH9 Forester XT for the past 5 years in city traffic and worst mileage I got was 5.5 liters/km when I'm really booting it (using full tank to full tank method of measuring FC).