dprantl

Assuming you are talking about the average MPG view and you reset it only once right before the trip, then you are getting 60MPG for the whole trip. If your view was set to instantaneous MPG, then you would be getting (60 + 16) / 2 = 38MPG. Gotta love that fuel cut-off during deceleration.

Dan
'91 928GT S/C 475hp/460lb.ft

AO

Running 42lb injectors renders the MPG readings and remaining distance useless (these are calculated based on 19lb injectors). So I usually keep the center one on temp. Left is speed and right is trip #1.

dr bob

Silly Intuitive Wabbits!

Since the the car got 16 MPG one way up the hill, it can get no better than 32 MPG for the whole trip, and that only if it uses absolutely no fuel on the downhill. To get the true trip value, you need to either weight the averages (too much work...), or try the easy solution: total miles up and back, divided by ((gallons used up the hill) + (gallons used down the hill))

---------------------

TSD math:

Point B is a mile from point A, and point C is a mile from point B, all in a straight line. If you drive 30MPH between point A and point B, how fast do you need to drive between points B and C to average 60MPH?

dr bob

OK, since nobody wants to step up, the answer is.... [drum roll] ...































You can't. Driving 30 MPH for the first mile A-to-B takes 2 minutes. To average 60 MPH over two miles A-to-C takes 2 minutes, the same 2 minutes you already used up A-to-B.

OK to go back to sleep now.

AO

Zzzzzz.......

dprantl

I really should have spent more than 10 seconds replying to Dr. Bob's original MPG question.

Dan
'91 928GT S/C 475hp/460lb.ft

jon928se

Uphill to the cabin suggests unpopulated area up in the mountains - hence twisty back roads - Bwaaaaaaaaaaaaaaaaah.

Option A - you were on an economy drive, thus your digi-dash is broke it should have read 90MPG on the way down. Thus average is 32MPG

Option B - Disgraceful - should have been below 10MPG on the way up - and on the way down depends on the size of your cojones - Who cares what the MPG is, check the fluids and that the brakes have cooled down then do it again.

dr bob

"Unpopulated" but not "unpatrolled".

There's a long story about a ride up the hill "at speed", a black-and-white chase/pursuit car, the discussion with the driver of said black-and-white pursuit car, the expiration of the engine in said black-and-white pursuit car during the discussion, the $75 fine since he couldn't clock me (his admiission), and an absolutely awesome weekend of skiing, knowing I'd blown up a cop car motor and it only cost me about $75.

Now I drive a lot more conservatively, unless I have a trunk full of ECM gear to make it 'safe'.


Best 928 mountain-cabin story was when Mark Anderson's dad dropped in to tell me about his son's little business down the hill.