Still no actual highway MPG tests?????

:welcome: ask danny on the ask danny thread.

 

What you're asking for isn't a hwy mileage test but rather a brief, and thus meaningless, instant reading. I can do this in my Gen3 and under optimal conditions achieve 75mpg yet in horrible conditions sink into upper 20's but neither are typical.

I'd say a reasonably level, continuous 30 minute stretch (15 minutes each direction) would give you real world figures. That opportunity is usually not available at a PR event.

 

read Dannys review... he said he was able to get his numbers easy.

 

A real highway test would definitely NOT involve cruise control and would have to include detail on actual speeds, terrain and traffic. It's hard to do, but I have managed doing it using an app. on my android.

Ideally a Gen II or Gen III hypermiler would drive it extensively and give us the numbers and the speeds.

One thing I would like to know is the ambient temperature at which Danny claims 57.8 mpg at 73 mph.

If that figure holds for someone who claims NOT to be a hypermiler and we can get 65 MPG at 73 mph without A/C or wind or traffic, that would be awesome. That would really be awesome.

I'm currently getting about 49 mpg on my Gen II when I'm driving at ~73 mph.

 

Duplicated post.

 

I would not expect 57.8 @73, if that is the case then something is really wrong with reporting in the car or the epa test. Bob Wilson used to test the cars cruising at a fixed speed and tried to calibrate for errors. He got about 50mpg @70 mph in a new gen III, which should be better fuel economy than you get in a prius c @73.

 

Yet this is what Danny claims in repeated tests. Even temperature variation would not account for such a high figure.

"On the interstate, where I was supposed to be averaging 46 MPG, I was achieving 57.8 MPG going 73 miles per hour. I was shocked by the efficiency numbers I was able to pull down. It was easy. Simple. Other trips brought about similar results."

http://priuschat.com/news/2012-toyota-prius-c-review-the-affordable-60-mpg-monster

 

I am not doubting that that is what danny saw. What I am saying is it is quite likely that the test procedure and/or indicated mileage are off by a significant amount. Every indication is that the prius c will get worse not significantly better fuel economy at 73 mph.

 

Hank, this may help...

http://www.cleanmpg.com/forums/showthread.php?t=42156&page=5

 

Forgive me for insisting -and with all respect to Wayne- but we need elevation and average speed documented from a cell phone application.

45-65 mph doesn't mean much. The question is how does it do at a speed between 70 and 75 mph. We need that speed and elevation documented to reach conclusions. If it can reach 60 mpg as Danny implies that would just be stellar. The best I have had on a Gen II in mildly hilly terrain with an average speed of 61 mph was 62.7 mpg.

Also note that the weather in this route is generally very mild and ideal.

Here are some examples of what the app shows

 

Also the run was a round trip so elevation and wind etc.will cancel out. With a run of 85 mpg in mild weather dry roads etc. and moderate speeds driven by a mpg conscious driver the regular driver
with 65-70 speed could expect at least 55 mpg. Our prius at that
speed in summer conditions is about 52-55 mpg true mpg (calculated).

 

It's there and back, so total change is 0.

Speak for yourself. Speed limits are max 65mph where we drive (we don't go on I95 past Stillwater) and our commutes are max PSL 55mph (although it would be my wife's commuter and she sometimes drives at 60mph). I want to know how it does on hills at 55mph to 60mph. We have the Prius.

Actually, I hope it's absolutely terrible at 75 mph because that would put more buyers off and leave more for the rest of us.

 

If the price of gas goes to $5/gallon or more don't count on many
Prius' no matter what model being in dealers lots gathering dust.

 

No, the way you WS while going up and down and how wind swirls impact data a lot.

Another factor is whether the battery pack can provide enough power to maintain a relatively steady speed without losing momentum while the engine is spinning but not consuming gasoline. So the slope is critical, you want as little slope as possible to allow your battery pack alone to maintain momentum for as long as possible. MD has some great hills for this, but the terrain flattens out as you go past DE and mpg drops.

Wayne, Hobbit and other hypermilers get amazing mpg, but we really need to record elevation and especially average speeds using an accelerometer to standardize what we are talking about. Also, 55 mph will not get it done in the northeast.

 

The slopes count. Please read my post above for the reason. More so, formal recording of average moving speeds.

 

As far as slopes I can understand if you drive one way from a high
or low elevation and you compute your mpg.

But when you drive both ways, like we did last year from Seaside Oregon to San Francisco and back, with a mpg calculated at 54 mpg
how can those figures not be accurate?

During the trip we climbed nearly 5,000 feet but we left at sea level
and returned at sea level, so I just don't see how my mpg is not
accurate...

alfon

 

look, all the test drives so far are done with toyota-loaned vehicles by journalists on controlled courses. the kind of detail that was posted up for gen III, while absolutely great, will not become available until regular people actually GET these cars in their hands and can drive them anywhere instead of on pre-determined courses. just have patience, christ.