Comparo: Most OPEX efficient car (using financial figures)

[ano727]

Hi,

So far, have seen quite a lot of good comparos on the small and FC-efficient car choices (Accent, Jazz, Vios, Focus Diesel, etc).

This time, would like to get a good apple-to-apple comparison based on actual OPEX figures. Please disregard car price, and exclude hybrid. Both MT and AT can be included.

To make the comparison more real life and comparable, here are the basis of computation.

OPEX FIGURES
Fuel costs: use 1000kms per month (or 12Tkm per year) / Efficiency in KPL then multiply by fuel cost per liter (P41 for diesel or P52 for gas)
PMS: pls indicate average cost per PMS, and how many times in a year as per dealer practice

So, total OPEX per year is fuel costs to run 12,000 kms, PLUS total PMS costs.

For example:
Car: Montero GLS AT (not the most efficient, but just to illustrate based on actual figures)
Fuel costs per year: (12000kms/8km/liter) * P41/liter) = P61,500
PMS: Around P6T per PMS * 2PMS in a year = P12,000
Total OPEX per year = P73,500
or Cost per km = P6.15/km (Thanks Vinj for adding this info)

Please share what you get from your cars, so we can figure out what makes financial sense best in terms of cost of usage.

Thanks.

[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.

[ano727]

Still 4Tkm old, but here's projected figures for CX9:

Car: 2013 CX9 AT 3.7liters
Fuel cost per year: P120,000 (12Tkm * 5.4km/liter * average P53/liter gas)
PMS: zero for first year
Total OPEX: P120,000
Cost per km: P10.00/km

If assume 2 PMS per year costing P10,000 total: Cost per km: P10.83/km

Am using Gas Cubby app to monitor fuel consumption.

[EQAddict]

can you put ave.km/liter and cost of fuel per liter for the CX9 as well as projected PMS costs . I think the zero PMS costs kinda skews the value somewhat. But this is a nice thread.

[ano727]

can you put ave.km/liter and cost of fuel per liter for the CX9 as well as projected PMS costs . I think the zero PMS costs kinda skews the value somewhat. But this is a nice thread.

Edited above to reflect your requested additional info.

[EQAddict]

we should sticky this. nice one Ano727. I will see if I can post info on my cars as well.

[arsen]

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.

[vinj]

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.

[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.

[ano727]

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

Hehehe, nice one! Pang April fools!

Hindi, yung kay Mguy.

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

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.

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.

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.