I did a 600odd mile trip across Europe and clocked 3.9 l/100km according to the dashboard display. This was mainly motorways were I averaged about 100kmh/65mph.
I may be just a dumb American , but 100km/hour = 62 MPH , I reckon. Still , 3.9l/100km is pretty nice for a big comfortable car like the 6.
You don't have to guess or approximate if you own a simple calculator and remember the definitions of the relevant units. (0.0254m/in)×(12in/ft)×(5280ft/mile)×(0.001km/m)= 1.609344 km/mi exactly.
Actually, this is easier for those of us that hate math. http://www.tdiclub.com/misc/conversions.html
or even easier yet... ask Google/Siri/Alexa/Cortana. I only use the first one, so ymmv. edit: and another one I learned a week or so ago, if you're ok with arithmetic: divide the litre/100km by 235.215 (rounded off however you like) to get the mpg. // edit: erroneous; see following replies //
But that requires memorizing a seemingly arbitrary number of 6 significant figures which isn't a fundamental definition of anything, is useful only for this one specific "conversion," and still is only an approximation. Knowing and using basic definitions (as in my post #5), none of which have more than 3 significant figures, doesn't require memorizing anything so specialized, and is exact. You can recycle and rearrange the same definitions for many other purposes. That 235.21458... comes from (2.54*2.54*231*10000)/(12*5280), where 2.54 cm = inch, 231 cubic inches = gallon, 12 inches = foot, 5280 feet = mile. .
This is the only equivalence that I don't keep in my head. There's no need to go beyond 3 digits for the purpose of an approximation. Quick and easy is the goal.
Maybe I'm not so good with arithmetic , but it seems like that is backwards. I would divide the 235.xxx number by the l/100km.
You got me, Edwin. What I see in my mind is 1 l/100 km = 235.xxx mpg and go from there with an inverse relationship.
I looked it up once and put it in my MPG spreadsheet. Now I just use that formula and don't think about the math.
That's inversed! 1L/100km = 1 gallon/235.xxx miles. Edwin's way works. NOTE: Edited to to add the missing "100," my error.
I was sloppy and should not have used the mathematical equal sign. You've proven the inverse relationship that I intuitively attributed to the conversion. Thanks. Edit: more thoughts... so some numbers I'm starting to use to get a feel for l/100km... Edwin keeps the numbers below around 3.6-3.9 l/100km for his daily commute. Most normal people driving normal ICE cars are doing well keeping below 5 l/100km. (mid-40s mpg).
When I first got my Scangauge , I set it up for l/100km and used it that way for a few months. I can understand it pretty well , but it made recordkeeping a bit more difficult , seeing as how we buy fuel in gallons here.
Yes, we seem to be a bit stubborn that way... despite being taught the metric system and scientific disciplines using metric, our daily lives still revolve around standard units.
For most of the world, the metric system is the standard. We are the oddball outcasts who insist on doing everything the hard way.
So,... fantastic results. Can you tell us more about the conditions and techniques you used, or was it just a flat, single, bladder-busting 10 hour drive with cruise control on at 100 kph?
