Discussion in 'General' started by seftonm, Mar 22, 2014.
I just organized them, Wayne did all the testing and data collection
Nice work on the graphs
Nice package deal!!
I wish the ultimate car the Prius C had a graph. hehe
Okay, George just volunteered to do some testing on his Prius c !
How do I test and gather the data correctly?
I have a SG2 but what steps will I need to take to be accurate in collecting data?
I think Wayne has described his procedure in the past. Maybe he can point you to the old post that has this. I kinda wanna do this with my car, too.
What I did was this:
Find a straight and level stretch of road. That's harder than it looks.
For each speed point, get up to speed, set cruise control, then reset scangauge trip.
At the ending point, make a mental note of the trip average mpg.
Turn around and do the same the other direction.
Write down the two numbers, then calculate the average of the two.
Wayne's numbers don't always include a return trip because of varying situations, but as long as it's truly level and the wind is low it's a good reference point.
2013 Nissan Altima
I did a 55 mph CC test in 2009 with the Civic I still have today. I did a fill at a gas station very close to I-88 in Warrenville , then got on 88 going west and set the cruise. I did about 45 miles , then made a (illegal) U-turn and came back to the same gas station , same pump. The result was 49MPG , or about 2 MPG better than my 97 Civic. I don't remember if I was airing up my tires then. But I do know it was E10. Maybe I'll try again this spring
2014 Audi Q5 TDI
Wayne's Steady state 2013 HSH mph/mpg runs - each speed was 17 miles flat freeway with CC on and A/C off
50 mph - 58.5 mpg
55 mph - 55.7 mpg
60 mph - 51.8 mpg
65 mph - 46.7 mpg
70 mph - 40.3 mpg
My runs in a 2011 HSH after the ECU Update for 12 miles of rolling hills with CC on and A/C at 74 deg
55 MPH - 55.9 MPG (45-55 MPH different hwy for 10 miles)
57 MPH - 52.3 MPG
60 MPH - 43.7 MPG
65 MPH - 43.6 MPG
As you can see if you can possibly go below 60 you can get almost 10 more MPG's.
If you feel your HSH isn't up to par run your own test and compare it to ours. Make sure you start your test after at least a 15 minute ICE warn-up. Set your CC after up to speed then reset your instant MPG display and drive for at least 10 miles.
Finally completed the 2014 Lexus ES300h Speed vs. Fuel Economy chart.
The 2014 Lexus ES 300h is EPA rated at 40/39 mpg city/highway. Look where the ES 300h crossed its EPA highway rating.
And like most Toyota/Lexus aFCDs, the ES 300hs is a bit optimistic. While the odometer was 3.7 percent short – itself a rather large positive offset and measured twice over significant distances – the aFCD vs. actual still indicated 2.3% optimistic.
I'll toss in my 97 Volvo 960 steady state cruise controlled results.
Mostly to show just how much fuel mileage has jumped over the last 17 years.
2.9L twenty four valve I6. Four speed auto box with OD
I did some speed testing with my 1997 Volvo 960 when I was down in Naples in July of 07.
Tires Michelin Energy + 4's set at 42 psi, 44 max sidewall.
The test road is Rt 41 between Naples and Miami. I like this road for testing because it is very flat and most of the traffic now takes I-75 across the state. My starting point was the turn off for Everglades City. I ran 10 miles east then turned around and ran west back to my starting point.
Scan gauge readings were as follows.
Sg is extremely accurate to the pump fill numbers.
As long as you stop at the next .25 after the first click of the nozzle.
The MPG of each 20 mile run is as follows. Speed limit is 60 if I recall, so going ten over wasn't an option.
50 mph 35.4 mpg
55 mph 33.9 mpg
60 mph 31.15 mpg
65 mph 28.5 mpg
From experience running the speed limit of 70 mph with the AC on 25.5 mpg.
Running 65 mph max from Pittsburgh to Naples (1170 miles) using E10 26.5 to 27 mpg is closer to reality. Same trip using E0 at a maximum of 65 mph I use to get between 29.25 and 29.75 mpg. E10's supposed 3% loss over E0, my ass try closer to 10% difference in fuel mileage.
One thing I'm loving about this thread is no matter how you try to say it isn't so, speed does kill your gas mileage.
I still get a kick out of newbies who come here and claim that it doesn't.
Putting together the RX 450h review this evening and here is the Speed vs. FE graph. Given the 30/28 mpgUS city/highway rating for the AWD variant we are driving, I was not expecting much but it did break its EPA rating at a healthy 69.1 mph.
Notice the minuscule offset? Maybe the engineers and marketing execs are done playing games as this is the second review drive in a row that had an accurate aFCD (< 1% error).
A lot more to go on this.
I don't get it either. These people just may be having trouble properly measuring things. . . . . . . .
So the PRIUS gets the BEST actual FE?
And only a MT VW TDI very slightly beats is 59 vs 58 mpg at 60 mph
and 48 vs 45 mpg at 70 mph
With the diesel fuel premium-
can't see much point in a TD small car
or a TD 1/2 ton truck-not with the Dodge delivering 30mpg at 60 mph and 25 mpg at 70 mph.
The Dodge 1/2 ton is the most impressive graph.
Never thought I would see a 30 mpg at 60 mph 1/2 ton pickup with 300 hp
and from DODGE-not FORD who get in the mpg game much sooner
Yeah the Dodge pickup wins the "hard to believe" prize.
PS- Yes I know TD cars are more fun than the Prius-too bad Toyota insists on scrubbing the fun out of their cars. Bet it wouldn't be too hard for Toyota to "jack up" a Prius-higher performance 1.8(should be able to get 200+ hp from a 1.8 easily enough) and a jacked up traction motor-add 18" wheels-wider tires- better suspension-fancy "radio electronic computer crap" for youngsters-Voila' -
give up maybe 10mpg or so?
Unfortunately the Honda Accord-6 cylinder-probably gets close to 40 mpg at 60 mph-and it probably does 0-60 in well under 6 seconds-so maybe there isn't much point in a performance Prius-not giving up 10-15 mpg-
Oh well talked myself out of it
Charlie , there is something that can't be measured but is REAL and that is how easily the diesel cars can handle hills and mountains at speed. A Prius on level ground at lower speeds (65) might beat the diesel but will CERTAINLY struggle on hills.
The diesel swallows up the mountains and leaves them in the distance.
And at 60 MPH , the Prius will do 16-20 MPG better than an Accord V-6 ( my opinion).
After saying all that , for my purposes and typical driving , the Prius rules.
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