Question:
How much peso do I save for every liter of LPG?

From my estimates, every car has its own answer with said question. As for a 2004 Outlander. Here is my answer:

GIVEN:

Unleaded E10 Fuel Consumption: 7.10 KM/L
Unleaded E10 Peso per KM: 7.5 P/KM
Price of E10 Unleaded: 45.72 Peso/Liter (as of 26 October)

LPG Fuel Consumption: 5.55 KM/L
LPG Peso per Kilometer: 5.75 P/KM
Price of LPG: 30.20 Peso/Liter (as of 26 October)

SOLUTION:

Compute for the Total Price per liter of LPG
1. Get KM/L difference of E10 and LPG

7.10 - 5.55 = 1.55 KM/L = KM/L difference

2. Using Ratio and Proportion: Get the Price of the P/L difference:

KM/L KM/L 5.55 1.55
____ = ____ = ____ = ____ = 8.43 P/L = Difference P/L

P/L P/L 30.20 ?

3. Get total price of LPG = LPG P/L + Difference P/L

= 30.20 + 8.43 P/L = 38.63 P/L

4. ANSWER: Get the difference between E10 P/L and No.3

= 45.72 - 38.63 =7.09 Peso/L

[SIZE="5"]Currently, I save 7.09 pesos for every liter of gasoline.[/SIZE]