Comparo: Most OPEX efficient car (using financial figures)

**Ry_Tower** · April 2nd, 2013 05:50 PM

Originally Posted by ano727

The one to beat so far = Suzuki Alto * P4.82/km.

Hindi, yung kay Mguy.

**joemarski** · April 2nd, 2013 06:43 PM

^ Oo nga naman. Wala nang mas titipid pa kesa mga sasakyang hindi ginagamit.
Hindi ginagamit = walang gastos = TIPID!!!

**viper888** · April 2nd, 2013 09:00 PM

1982 Mercedes Benz 300SD
Odometer = 150,000+ (odo broke for a while, so thats just a estimate)
Est. Total Mileage / Year: 12000
Average Fuel Consumption: 14 km/L (85% Highway 15% City)
Fuel Cost per year: P34285
PMS Costs: 18,000 per year
OPEX/Yr: P52,285
Cost per km = Php 4.36/km

This doesnt include the Pxxx,xxx restoration......
and the PMS is a guess (oil change is 4-5k)

**arsen** · April 3rd, 2013 12:16 AM

Originally Posted by vinj

As with my daily driver:

2012 Altis 1.6E m/t
Total Mileage:15,397kms
Fuel Cost per Year: P77,862.10
Total Fuel used: 1,484.83L
Average Fuel Consumption: 10.36km/L
Service Costs: P9,620.80 (Total from 500km to 15,000km PMS at Toyota)
Total OPEX from March 2012 to March 2013: P 87,482.90
Cost per km = Php 5.68/km

I use the Android Fuel Log app to monitor my fuel consumption and expenses.

Nice one.
Your long-term fuel fill logging method is far better than a single journey full tank to full tank method. But still, influenced by the time of the day you do the fill.

Below is a study of fuel temperature profile (in the tank) taken in 4 consecutive days (0:0 means midnight, 1 notch is 3hours). You can see in the figure that the best time to do the fill is around 6:00 AM.

Full-tank-to-full-tank method is very inaccurate especially if there is a large volume of fuel remaining in the tank. This is because petroleum based liquid expands by 1% for a 10 to 15 degC temperature rise.

In a single journey, and let say fuel temperature inside the tank increases by 30degC due to the hot fuel from the return line; the volume of fuel could increase by 2 to 3% of volume.

So for example if someone driving diesel vehicle with tank capacity of 75 liters and traveled 400km, then at the end of his journey he just filled-in 24 liters of diesel at the station (means 75-24 = 51 liters remaining prior to the fill). He can easily compute 400km/24liters = 16.7km/liter then say wow great!

Taking into consideration the thermal expansion of let say 3%, we can remove the bubble (bloating) from the 51 liters remaining in the tank by
51/1.03 = 49.5 liters should only be the remaining volume inside the tank. This means that 25.5 liters should have been the volume filled to make up the 75 liters full tank capacity.

This also means that 400km/25.5liters = 15.7km/liter is the corrected average fuel consumption.

Kaya mapapa tsk tsk na lang dito sa method ng ating DOE pa man din. Only 333 kms traveled and many are having over 50 liters of fuel remaining inside the tank occupying more space (when fuel becomes hot) that should have been filled by fresh fuel from the station.
DOE Completes Record-Breaking Fuel Economy Run
http://www.doe.gov.ph/news/electrici...may%202008.pdf

Sana itago na lang ng DOE sa pinaka baul / archive nila. Kawawa naman yung gagamit ng DOE results as a reference baka mapagtawanan lang lalo na sa foreign forums.

**weisshorn** · April 3rd, 2013 10:45 AM

hindi talaga makuha ang eksakto ilan ang filled up fuel, may bubbles ang fuel right after ng topping. kailangan ng mahabang oras antayin para mag settle ang kinarga. need rin malaman ang actual temperature & coefficient ng expansion para macompute ang volume to corrected 15°C standard temp.. my own opinion lang po.

**ano727** · April 3rd, 2013 03:40 PM

Originally Posted by joemarski

^ Oo nga naman. Wala nang mas titipid pa kesa mga sasakyang hindi ginagamit.
Hindi ginagamit = walang gastos = TIPID!!!

Hehehe, nice one! Pang April fools!

Originally Posted by Ry_Tower

Hindi, yung kay Mguy.

Akala ko serious, yung pang April Fools pala ni Mguy yan.

Originally Posted by viper888

1982 Mercedes Benz 300SD
Odometer = 150,000+ (odo broke for a while, so thats just a estimate)
Est. Total Mileage / Year: 12000
Average Fuel Consumption: 14 km/L (85% Highway 15% City)
Fuel Cost per year: P34285
PMS Costs: 18,000 per year
OPEX/Yr: P52,285
Cost per km = Php 4.36/km

This doesnt include the Pxxx,xxx restoration......
and the PMS is a guess (oil change is 4-5k)

Wow! That is such a cost efficient Benz to keep! Beats the Alto in price per km.

Originally Posted by arsen

Nice one.
Your long-term fuel fill logging method is far better than a single journey full tank to full tank method. But still, influenced by the time of the day you do the fill.

Below is a study of fuel temperature profile (in the tank) taken in 4 consecutive days (0:0 means midnight, 1 notch is 3hours). You can see in the figure that the best time to do the fill is around 6:00 AM.

Full-tank-to-full-tank method is very inaccurate especially if there is a large volume of fuel remaining in the tank. This is because petroleum based liquid expands by 1% for a 10 to 15 degC temperature rise.

In a single journey, and let say fuel temperature inside the tank increases by 30degC due to the hot fuel from the return line; the volume of fuel could increase by 2 to 3% of volume.

So for example if someone driving diesel vehicle with tank capacity of 75 liters and traveled 400km, then at the end of his journey he just filled-in 24 liters of diesel at the station (means 75-24 = 51 liters remaining prior to the fill). He can easily compute 400km/24liters = 16.7km/liter then say wow great!

Taking into consideration the thermal expansion of let say 3%, we can remove the bubble (bloating) from the 51 liters remaining in the tank by
51/1.03 = 49.5 liters should only be the remaining volume inside the tank. This means that 25.5 liters should have been the volume filled to make up the 75 liters full tank capacity.

This also means that 400km/25.5liters = 15.7km/liter is the corrected average fuel consumption.

Good one! Very analytical. For purpose of simplification, we can just use practical assumptions with caveat that our computations may not be perfect, but a good guiding information.

Originally Posted by weisshorn

hindi talaga makuha ang eksakto ilan ang filled up fuel, may bubbles ang fuel right after ng topping. kailangan ng mahabang oras antayin para mag settle ang kinarga. need rin malaman ang actual temperature & coefficient ng expansion para macompute ang volume to corrected 15°C standard temp.. my own opinion lang po.

Yes, so let's just make very simplistic assumptions and calculations.

Thanks for all the inputs and feedback. Keep posting and sharing your car's figures.

**vinj** · April 3rd, 2013 04:06 PM

Originally Posted by arsen

Nice one.
Your long-term fuel fill logging method is far better than a single journey full tank to full tank method. But still, influenced by the time of the day you do the fill.

Below is a study of fuel temperature profile (in the tank) taken in 4 consecutive days (0:0 means midnight, 1 notch is 3hours). You can see in the figure that the best time to do the fill is around 6:00 AM.

Full-tank-to-full-tank method is very inaccurate especially if there is a large volume of fuel remaining in the tank. This is because petroleum based liquid expands by 1% for a 10 to 15 degC temperature rise.

In a single journey, and let say fuel temperature inside the tank increases by 30degC due to the hot fuel from the return line; the volume of fuel could increase by 2 to 3% of volume.

So for example if someone driving diesel vehicle with tank capacity of 75 liters and traveled 400km, then at the end of his journey he just filled-in 24 liters of diesel at the station (means 75-24 = 51 liters remaining prior to the fill). He can easily compute 400km/24liters = 16.7km/liter then say wow great!

Taking into consideration the thermal expansion of let say 3%, we can remove the bubble (bloating) from the 51 liters remaining in the tank by
51/1.03 = 49.5 liters should only be the remaining volume inside the tank. This means that 25.5 liters should have been the volume filled to make up the 75 liters full tank capacity.

This also means that 400km/25.5liters = 15.7km/liter is the corrected average fuel consumption.

Kaya mapapa tsk tsk na lang dito sa method ng ating DOE pa man din. Only 333 kms traveled and many are having over 50 liters of fuel remaining inside the tank occupying more space (when fuel becomes hot) that should have been filled by fresh fuel from the station.
DOE Completes Record-Breaking Fuel Economy Run
http://www.doe.gov.ph/news/electrici...may%202008.pdf

Sana itago na lang ng DOE sa pinaka baul / archive nila. Kawawa naman yung gagamit ng DOE results as a reference baka mapagtawanan lang lalo na sa foreign forums.

Interesting info.

I usually gas up at night (around 10-11pm) or in the morning (around 7am), and i try to use the same gas station and pump as much as possible.

**ano727** · April 6th, 2013 02:55 PM

Originally Posted by GPS60

1997 Mitsubishi Galant 2.0 V6 AT
Total Mileage / year: 5,000kms
Average Fuel Consumption: 7km/L (mainly city)
Fuel Cost per Year: Php37,143
PMS Costs: Php45,000 (one year of repairs)
Cost per km = Php 16.43/km

2009 Honda Jazz 1.3 AT
Total Mileage / year: 10,000kms
Average Fuel Consumption: 10km/L (mainly city)
Fuel Cost per Year: Php52,000
PMS Costs: Php14,000 (Php7K every six months)
Cost per km = Php 6.60/km

2010 Ford Trekker 2.5 TDCi MT
Total Mileage / year: 20,000kms
Average Fuel Consumption: 12km/L (city / hi-way)
Fuel Cost per Year: Php68,333
PMS Costs: Php32,000 (Php8K every 3 months)
Cost per km = Php 5.02/km

Low cost of ownership pala ang Ford Trekker, good to know. Thanks *GPS60.

Would be good if owners of Eon, i10, Mirage, Accent (gas and diesel), Alto, and other fuel efficient cars can give their respective OPEX info. Good guide for those looking for this kind of details before deciding on new purchases.

**ano727** · April 6th, 2013 03:11 PM

Originally Posted by viper888

1982 Mercedes Benz 300SD
Odometer = 150,000+ (odo broke for a while, so thats just a estimate)
Est. Total Mileage / Year: 12000
Average Fuel Consumption: 14 km/L (85% Highway 15% City)
Fuel Cost per year: P34285
PMS Costs: 18,000 per year
OPEX/Yr: P52,285
Cost per km = Php 4.36/km

This doesnt include the Pxxx,xxx restoration......
and the PMS is a guess (oil change is 4-5k)

Very good figures, looks like a good car to keep for a long time. Thanks *viper888.

**ronw123w124** · April 6th, 2013 05:37 PM

Originally Posted by viper888

1982 Mercedes Benz 300SD
Odometer = 150,000+ (odo broke for a while, so thats just a estimate)
Est. Total Mileage / Year: 12000
Average Fuel Consumption: 14 km/L (85% Highway 15% City)
Fuel Cost per year: P34285
PMS Costs: 18,000 per year
OPEX/Yr: P52,285
Cost per km = Php 4.36/km

This doesnt include the Pxxx,xxx restoration......
and the PMS is a guess (oil change is 4-5k)

One of my cars is also a Benz 300SD but mine is an 81 model, sobrang tipid nga nyan, its even more fuel efficient than my other Benz which is an 82 300D W123 body. Nung unang gamit ko sa 300SD kala ko sira yung fuel gauge until sinubukan ko pa full tank, I realized na konti lang talaga consumo ng diesel.

Another nice thing about old Benzes is that they're so old that depreciation is non existent with these cars, in fact ang taas nga ng bentahan ng mga Diesel Benzes these days.