Gordo said:
My electric scooter costs me @ $0.008 per kilometer. My car $0.12 per kilometer. My SUV $0.14 per kilometer, my RV $0.28 pkm and my boat $0.38 pkm. As the RV costs $0.30 pkm when towing the boat, it seems the smartest idea is to never launch it, just tow it around?
This got my curious to see how much of a difference there is in fuel costs for various mileages. I threw together this spreadsheet if anyone's interested (see attached file). It takes $/gallon and miles driven per year (mpy) and determines the gallons per year (gpy), $ per year, $/mi and $/km for every integer mpg from 1 to 100, as well as the savings in $/year for each step, plus off to the side the savings in $/year, $/mi, and $/km between two user-definable mpg values.
It's interesting. The dropoff of savings per year is relatively negligible once you pass a certain point, that is a lot lower than I thought it would be. For example, purely in fuel costs, at current average US fuel costs (say, $3/gal), with my current ~10,000 mi/year driving habits, going from 40mpg to 50mpg would only save me $150/year...and going from 50 to
80 would only save me another $225/year. Compared to the difference between, say, 15 and 30 ($1,000/year), the difference in cost becomes relatively minor, especially when the cost of the new vehicle comes into play. For example, the 2010 Prius has a MSRP starting price of $22,800 vs the 2010 Corolla MSRP starting price of $15,600. They don't list the combined mileage figure for the Corrola, but going off strictly the spec values (yes, I know, real world values would probably be better, but the spec values are right there), the city/highway values are 51/48 and 28/35 respectively. That works out to a savings of probably between $483.19 and $232.14 per year, depending on driving style/environment/etc. Even if gas were to go up to $10/gal, that would only increase to between $1,610.64 and $773.81 per year, so even at $10/gal you would have to keep the Prius for at
least about 4.5 years to break even. Personally, I run my vehicles into the ground (well, vehicle, I'm still on my first car; got it at ~130k, currently almost at 156k, planning on running till at least 200k), so 4.5 years is nothing to me in terms of vehicle life, but for your average American consumer that's a pretty long time.
Disclaimer: I'm not by any means saying that high mileage is pointless; I think every industry should try and be as efficient as possible. I just found the results interesting and thought some of you would too.