1. Subscribersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
    28 Dec '04
    Moves
    52724
    25 Sep '06 03:08
    You see the price of petrol going down but its still very differant from place to place. You know about a gas station that has gas cheaper than the one a couple of blocks from home. So make a formula that takes into account the money you save by going to a distant gas station vs. the distance. Obviously if you drive 50 Km to save a couple of pennies per liter you probably spend more for the trip than the savings. So what is the formula for figuring out all such cases?
  2. Standard memberPBE6
    Bananarama
    False berry
    Joined
    14 Feb '04
    Moves
    28719
    25 Sep '06 04:07
    Originally posted by sonhouse
    You see the price of petrol going down but its still very differant from place to place. You know about a gas station that has gas cheaper than the one a couple of blocks from home. So make a formula that takes into account the money you save by going to a distant gas station vs. the distance. Obviously if you drive 50 Km to save a couple of pennies per lit ...[text shortened]... pend more for the trip than the savings. So what is the formula for figuring out all such cases?
    Let:

    S = savings (dollars)
    B = base price of petrol (dollars/litre)
    C = cheaper price of petrol (dollars/litre)
    V = volume of petrol purchased (litres)
    d = distance between petrol stations (kilometers)
    k = mileage proportionality constant (depends on average speed, car design, car condition, etc...) (kilometers/litre)

    Assuming you will do either of the following:

    (a) drive an insignificant distance to the base petrol station, purchase enough petrol to completely fill the tank, then drive an insignificant distance home; or

    (b) drive some distance "d" to the cheaper petrol station, fill up enough petrol to completely fill the tank, plus purchase enough petrol in a can so that you can fill up the tank completely when you get home, then drive home (same as driving to the base petrol station) and fill up the tank;

    Then:

    S = B*V - C*(V+2*d/k)

    The break-even point occurs when S=0, which gives:

    B*V = C*(V+2*d/k)

    C = B*V/(V+2*d/k)

    Here are some typical values for me:

    B = 0.85 dollars/litre
    V = 40 L
    d = 5 km
    k = 9.8 km/L (2002 Ford Taurus)

    With these numbers, the break even cheaper price would have to be 0.828 dollar/litre before I would start saving money. But even if the cheaper price were 0.80 dollars/litre, I'd only be saving about $1.18 on a $34 purchase. Probably not worth the hassle of the extra drive and putting in more petrol from a can.
  3. Standard memberuzless
    The So Fist
    Voice of Reason
    Joined
    28 Mar '06
    Moves
    9908
    25 Sep '06 14:151 edit
    Originally posted by PBE6
    Let:

    S = savings (dollars)
    B = base price of petrol (dollars/litre)
    C = cheaper price of petrol (dollars/litre)
    V = volume of petrol purchased (litres)
    d = distance between petrol stations (kilometers)
    k = mileage proportionality constant (depends on average speed, car design, car condition, etc...) (kilometers/litre)

    Assuming you will do either of ase. Probably not worth the hassle of the extra drive and putting in more petrol from a can.
    plus wear and tear on your vehicle driving the extra distance...and I think there should be a "danger" variable proportional to the distance driven...might get in an accident which would shoot your costs way up.

    Then there's also the fact the road will get worn out a bit quicker by you driving your 2 tonne car down it, which means the city will have to pay to repair it that much quicker, which means your taxes will have to be raised to pay for the road repair.

    The stress you may incur from the extra drive may impact your health and cause you to go see the doctor which may or may not cost you money depending on if you have health insurance and what the deductible is.

    And if you had to call the wife to tell her you'd be late for dinner because you are driving further away for gas will probobly cost you 10cents/minute on long distance charges.
  4. Subscribersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
    28 Dec '04
    Moves
    52724
    29 Sep '06 18:262 edits
    Originally posted by uzless
    plus wear and tear on your vehicle driving the extra distance...and I think there should be a "danger" variable proportional to the distance driven...might get in an accident which would shoot your costs way up.

    Then there's also the fact the road will get worn out a bit quicker by you driving your 2 tonne car down it, which means the city will have to pay driving further away for gas will probobly cost you 10cents/minute on long distance charges.
    So the gist of that is: Ride a bicycle! maybe with a solar powered electric motor🙂
    The solar panels could be over your head and thus protect you from the flaming sun and give protection from rain. Of course it a big wind comes up, you are in trouble.....
    The car in PBE6's example in US stuff is this: gets 23 MPG, gas costs $2.90 per gallon(US) and he drove only about 3 1/8 miles and the price would have to drop about 11 cents per gallon US to be worth the effort to drive. I am suprised by the amount it needs to drop to be worthwhile, especially because the distance is so short. Of course the actual miles driven is twice so its a round trip of 6 1/4 miles to save the money. Interesting, no?
  5. Joined
    19 Oct '03
    Moves
    69376
    30 Sep '06 03:52
    Originally posted by sonhouse
    You see the price of petrol going down but its still very differant from place to place. You know about a gas station that has gas cheaper than the one a couple of blocks from home. So make a formula that takes into account the money you save by going to a distant gas station vs. the distance. Obviously if you drive 50 Km to save a couple of pennies per lit ...[text shortened]... pend more for the trip than the savings. So what is the formula for figuring out all such cases?
    i believe the word is gasoline, not petrol
  6. Subscribersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
    28 Dec '04
    Moves
    52724
    30 Sep '06 16:39
    Originally posted by TDR1
    i believe the word is gasoline, not petrol
    I was telling the Eurotrash version🙂
  7. Argentina
    Joined
    23 May '03
    Moves
    2029
    30 Sep '06 17:12
    That's why I love so much my bicycle 😛
  8. Subscribersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
    28 Dec '04
    Moves
    52724
    30 Sep '06 17:41
    Originally posted by CrazyLilTing
    That's why I love so much my bicycle 😛
    Indeed. It's the most efficient people transport known to mankind.
  9. B is for bye bye
    Joined
    09 Apr '06
    Moves
    27526
    01 Oct '06 06:18
    Yeah... walking is so less efficient, with all that requirement for extra equipment and refinement of materials. Good point.
  10. Joined
    28 Nov '05
    Moves
    24334
    03 Oct '06 06:111 edit
    Originally posted by TDR1
    i believe the word is gasoline, not petrol
    And you call it "gas" because it's a liquid?

    What's the US for "Liquid Petroleum Gas" ?
  11. Subscribersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
    28 Dec '04
    Moves
    52724
    03 Oct '06 16:01
    Originally posted by aging blitzer
    And you call it "gas" because it's a liquid?

    What's the US for "Liquid Petroleum Gas" ?
    Propane
  12. Subscribersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
    28 Dec '04
    Moves
    52724
    03 Oct '06 16:03
    Originally posted by Gastel
    Yeah... walking is so less efficient, with all that requirement for extra equipment and refinement of materials. Good point.
    Ok, lets see, anyone know the differance between the environmental impact for making shoes v bicycles?
  13. Standard memberuzless
    The So Fist
    Voice of Reason
    Joined
    28 Mar '06
    Moves
    9908
    03 Oct '06 19:04
    Originally posted by aging blitzer
    [b]And you call it "gas" because it's a liquid?

    [b]
    No it's gasoline...gas for short. Ever heard of homonym?
  14. B is for bye bye
    Joined
    09 Apr '06
    Moves
    27526
    04 Oct '06 02:18
    Originally posted by sonhouse
    Ok, lets see, anyone know the differance between the environmental impact for making shoes v bicycles?
    You need shoes to walk? Hmmm.... thank goodness Nike was the first corporation ever! All those mammoths would have been impossible to overcome without the Nike 'Game Stalker' (Jordan edition).
  15. Joined
    28 Nov '05
    Moves
    24334
    04 Oct '06 07:32
    Originally posted by uzless
    No it's gasoline...gas for short. Ever heard of homonym?
    That would make it an abbreviation.
Back to Top