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frogster

Posts: 2860

Posted: Mon, 27th Apr 2015 13:44 Post subject: banging my head around a simple problem since this morning.	Quick Quote Quote

i hate cars, so that may be the reason i'm struggling to calculate. lets say we have a car 10.000 euro -> 5.6 l/100 km 2'nd car, 15.000 euro -> 3.8 l/100 km. 1 l => 1.2 euro, so with 5000 euro -> ~4100 l. nevermind power and other details, after how many km you can say that the 15.000 car is worth the price ? i have like 5 different calculations every one with different results so if you can explain a bit, i would love to hear it. thanks.

moosenoodles

Posts: 18411

Posted: Mon, 27th Apr 2015 14:21 Post subject:	Quick Quote Quote

you do not even need to worry about it. You can either afford the 5k more or not. If it's just a mental torture problem where you worry about spending that much on a car then math is not the problem. Sounds to me like you are on the edge of concern regarding paying for the fuel anyhow. http://www.speedtest.net/result/4302967033.png

frogster

Posts: 2860

Posted: Mon, 27th Apr 2015 14:30 Post subject:	Quick Quote Quote

nope, the original talk was to get toyota corolla or hyundai i30, both custom configuration at around the same price ~17k. still debating this. budget is <20k. that 3.8l/100km is a 1.33 motor 90 hp one, and i would not chose it anyway. don't know how we manage to get to the discussion above, but is making me mad that i canot solve 100% for sure a simple math problem. i'm up to the next level, asking some coworkers, but is seems that i'm not the only one stuck with simple math ).

frogster

Posts: 2860

Posted: Mon, 27th Apr 2015 15:46 Post subject:	Quick Quote Quote

after more head beanging, we got this, and we are kinda puzzle by result. (5 people working on it.) 1' car with 5.6 l -> 100 km 2' car 3.8 l -> 100 km. difference is 1.8 l. so we need to repeat this process 4100/1.8 times, which is : 2277 times. 2277 * 100 -> 227777 km (was on of my results, but i deleted because seems like a way to big number.) so basically when you drive for over 227.777 km, you end the payment for a low fuel motor which costed 5000 euro. unless we again fucked up something. :/

H4wkeye

Posts: 4699
Location: CTU

Posted: Mon, 27th Apr 2015 16:32 Post subject:	Quick Quote Quote

Both of those consumptions are fine just buy what you like. My car averages 8L/100km in the city and 4.8L/100km outside, I got used to it.

PickupArtist

Posts: 9933

Posted: Mon, 27th Apr 2015 16:45 Post subject:	Quick Quote Quote

also count over 30% more visits to the gas station, which costs u real life time, any time u can save , is worth hard euros, as u can not buy time back but always make more money

frogster

Posts: 2860

Posted: Mon, 27th Apr 2015 18:37 Post subject:	Quick Quote Quote

guys forget about the car )). we will buy something which eats more than both of them. and cost more. i was mad and still i am mad that i failed at basic logic and math, and we were in the end 5 people to reach the result. and for that we used a 4000 lines spreadsheet to reverse engineer the simple ( 4100/1.8 )*100, because noone was sure about the result. and we are talking about people wit 14+ years background in it (myself) and 10+ years in programming. today was a sad day

Danyutz

Posts: 4418
Location: Redplanet

Posted: Mon, 27th Apr 2015 20:38 Post subject:	Quick Quote Quote

Well, the amortization of fuel costs is calculated per year and it's usually often within companies, i never heard an individual calculate this. Also, amortization is calculated on diesel cars ( lower fuel consumption, sometimes cheaper, etc. ). Question is, you want to find out when the car is worth the investment? I like cars

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