September Fuel Economy Stats

Date: 06 September 2010
Total Dist: 15498km / 9630mi
Tank Dist: 861km / 535mi
MFD: 3.8L/100km or 61.89mpg US
Calc'd: 4.02L/100km or 58.51mpg US 5.79% diff
Fuel Added: 34.64litres or 9.15US gal
Average Speed: 44km/h or 27mph

Remarks: I wish the MFD was to 100th instead of only 10th as there is about a 2mpg (US) between 3.80 and 3.89, however ..not a big deal.

 

Date: 15 September 2010
Total Dist: 16519km / 10264mi
Tank Dist: 1021km / 634mi ## New record ##
MFD: 3.8L/100km or 61.89mpg US
Calc'd: 4.04L/100km or 58.22mpg US 6.32% diff
Fuel Added: 41.26litres or 10.9US gal
Average Speed: 41km/h or 26mph


Remarks: 4 tires @ 40 psi (15inch) , 98% eco and AC on auto , mostly in town with a few short runs out of town. I have been running the next tank in PWR mode just for fun to see what type of mileage I get. Will also start filling up at 2 bars for a while, wife's orders ...LOL :redface:

 

I would be interested to know - when people quote their refill gallons, are you filling it until it clicks off, or, is the refill amount topped off? I routinely can add another 0.5 gallons of gas after it clicks off, but one poster (on the main Prius folder) said he usually can add 2-3 gallons after the pump "clicks off".

My question goes to...if we don't believe the computer readout/MPGs, then how accurate is the amount of gas consumed...if we base that amount on an inaccurate measure of how much gas we put back into the tank at each fillup. Seems to me, that can vary with pump and methodology. We seem to assume that the amount we refill, is equal to the amount consumed. Without careful meaurments, I'm not sure that assumption is always valid.

 

Aug 30, 2010 thru Sept 20, 2010

Miles: 2,592.1

Gal's: 49.896

Actual MPG: 51.950

I reset trip B after every fill up, but my computer mpg is fairly consistently optomistic with being off 2.5 to 3.5 mpg

It just seems that short fillups say uner 150 miles are more consistently accurate with the computer than say 400-500 mile trips.
Just my opinion.

alfon

 

Valide Points Michael

I always stop filling once the pump clicks off the first time (I slow the rate down once I get close to where I think it will click off) Also I "TRY" and fill up at the same pump if possible, last 4 or 5 tanks have been same station and pump.

It may be worth adding that I'm using 87 octane with no ethanol.

Dan

 

Date: 27 September 2010
Total Dist: 17,353km / 10783mi
Tank Dist: 834km / 518mi
MFD: 3.8L/100km or 61.89mpg US
Calc'd: 4.07L/100km or 57.79mpg US 7.11% diff
Fuel Added: 33.98litres or 8.98US gal
Average Speed: 41km/h or 26mph


Remarks: All in PWR mode, 4 tires @ 40 psi (15inch) , and AC on auto , mostly in town with a few short runs out of town. Same pump for last 6 fill-ups and using non-ethonal gas 87 oct.

Not much of a difference in gas using pwr mode, but certainly a huge difference in the "feel" of the car.

 

Date:3 September 2010
Total Dist: km /3225.3
Tank Dist: km /382.3
MFD: L/100km or 52.2 mpg US
Calc'd: L/100km or 50.039 mpg US
Fuel Added: litres or 7.64 US gal
Average Speed: km/h or 28 mph

Date: 10 September 2010
Total Dist: km /3631.2 mi
Tank Dist: km / 405.7 mi
MFD: L/100km or 49.8 mpg US
Calc'd: L/100km or 47.57 mpg US
Fuel Added: litres or 8.53 US gal
Average Speed: km/h or 57 mph

Climbing altitude and strong cross winds

Date: 11 September 2010
Total Dist: km /3952.0 mi
Tank Dist: km /320.8 mi
MFD: L/100km or 48.1 mpg US
Calc'd: L/100km or 46.91 mpg US
Fuel Added: litres or 6.839 US gal
Average Speed: km/h or 61 mph

Climbing Altitude and strong winds from cold front

Date:17 September 2010
Total Dist: km /4328.3 mi
Tank Dist: km / 376.3 mi
MFD: L/100km or 57.6 mpg US
Calc'd: L/100km or 54.48 mpg US
Fuel Added: litres or 6.907 US gal
Average Speed: km/h or 64 mph

In the Rocky Mountains

Date: 18 September 2010
Total Dist: km / 4771.3 mi
Tank Dist: km / 443.0 mi
MFD: L/100km or 53.1 mpg US
Calc'd: L/100km or 51.05 mpg US
Fuel Added: litres or 8.679 US gal
Average Speed: km/h or 65 mph

Coming back down from the mountains...
Wonderful trip, Pearl ran up and down the mountains like they were flat land! :cheer2: