Vehicle Gas Consumption - Accurate? - Page 2

 
Relative to itself, it is linear. So if you use them like I  do for
mph vs MPG testing, go for it. But the Gold Standard is:

1) Use GPS or highway mile markers to measure and calculate the tire/
odometer offset. This changes over time so it needs to be calibrated
every 5-10,000 miles.

2) Consistent use of the same pump fed by an underground tank in a
state that had a functioning weights and measurement department.

3) Consistent fill-up protocol that should extend beyond the 'first
click'.

But now we're  getting into the  anal retentive region of engineering
metrics. <grins> ... where I live.

As a general rule, we've found the ZVW30 (aka., 2010 Prius) to be
about  6% optimistic but it is consistent. I have no idea what the
other models report and even though we have an NHW11, I really don't
care.

Bob Wilson

 

I have compared one tank so far with my C, and I did not top off either
fillup, but did use the same pump.

Dash reading:  52.0 MPG
Calculated: 50.9 MPG

Doing my second tank now, and will top off both.  Let you know the results
next week.


Bob

 On Thu, 26 Apr 2012 06:13:23 -0400, DanielleOM wrote:


Check for yourself. I purchased my 2007 last month based on the display
mileage (47 on a long test on both city and highway). I just checked it.
Display said 44.8, but it was really only 39.8 :( That is combined highway
and city. That matches the best highway mileage I ever got on my 98
Corolla, down to about 33 after 240,000 miles on it.

 On 5/4/2012 3:04 PM, Michael Dobony wrote:

I filled up on the 1st of the month as I wanted to start off the month
noting in MS money the gas was toward the prius C.  The sent me off wit
a full tank from the dealer.  My calculations showed that I got 50+ mi
per gallon.  I will check again next month.  Most of my mileage was on
Connecticut two lane roads where speeds are typically between 35 and 50
miles per hour.  From what I have seen the city rated mileage seem to
apply for those speeds.  I was very impressed by how the car did one
mileage over rolling hills between Granby, CT and Barkhamsted, CT.  I
did some highway driving at 60 - 70 miles per hour but not a lot.

Danielle

 On Thursday, April 26, 2012 5:13:23 AM UTC-5, DanielleOM wrote:

I'm on my 4th Prius, have had at least one of each generation. Anal-retenti=
ve personality that I am, I have recorded for each tank the fill-up amount,=
 displayed MPG, outside temperature, cost and calculated the actual MPG. Ge=
nerally speaking, the Prius displays were all significantly optimistic in t=
he MPG department. Overall, on 25 fills so far on my 2011, actual MPG avera=
ges 6.2% less than the MPG on the display.