Great MPG
#33
I have been keeping a spreadsheet for over 5 years and I can also say that my computer is very accurate from one fill to the next as well as over the long haul.
The red line is the car trip computer and the blue line is my spreadsheet calculation. Given that 10% is about 2.2mpg you can see that my computer is almost always within 2-3% of the mathmatically calculated mpg. I dont burp, squeeze, refill, or do anything special when I fill my tank.
The red line is the car trip computer and the blue line is my spreadsheet calculation. Given that 10% is about 2.2mpg you can see that my computer is almost always within 2-3% of the mathmatically calculated mpg. I dont burp, squeeze, refill, or do anything special when I fill my tank.
#35
My stats, using the "aCar" Android app http://play.google.com/store/apps/de...onewalker.acar
(see attached image)
Min: 12.5mpg (short 5 miles each way commute)
Max: 24.6mpg (70 freeway miles @ 80mph mostly. No speeding tickets, Lol)
Sent from an Android device using IB Automotive Group forum reader.
(see attached image)
Min: 12.5mpg (short 5 miles each way commute)
Max: 24.6mpg (70 freeway miles @ 80mph mostly. No speeding tickets, Lol)
Sent from an Android device using IB Automotive Group forum reader.
#37
Lexus Champion
My stats, using the "aCar" Android app http://play.google.com/store/apps/de...onewalker.acar
(see attached image)
Attachment 326459
Min: 12.5mpg (short 5 miles each way commute)
Max: 24.6mpg (70 freeway miles @ 80mph mostly. No speeding tickets, Lol)
Sent from an Android device using IB Automotive Group forum reader.
(see attached image)
Attachment 326459
Min: 12.5mpg (short 5 miles each way commute)
Max: 24.6mpg (70 freeway miles @ 80mph mostly. No speeding tickets, Lol)
Sent from an Android device using IB Automotive Group forum reader.
#38
What are your average speeds on the trip computer? Mine is only 33 mph. Does not seem to go above that and my tank average is usually 21 mpg. Even though I drive on the highway for 80% of my commute between 60 and 80 mph for 18 miles. The amount of time stopped in traffic and driving in the city really kills the average.
Last edited by Lavrishevo; 04-30-14 at 08:31 AM.
#39
I only enter date, odometer mileage and number of gallons of gas I bought, each time I refuel. Here's what it looks like for my LS430:
And from my former ES300, for comparison:
Last edited by Natey2; 04-30-14 at 08:46 AM. Reason: Add ES300 mpg chart for comparison
#41
Mine will do 25 - 29 mpg all day long on the highway depending on how I drive. If you kind of hypermile the 430, lol, she can get about 31. On the highway of course. Amazing car for long trips.
This is interesting:
http://en.wikipedia.org/wiki/Energy-efficient_driving
This is interesting:
Pulse and Glide
Pulse and Glide(PnG) is also known as Burn and coast. This method consists of rapid acceleration to a given speed (the "burn" or "pulse"), followed by a period of coasting down to a lower speed, at which point the burn-coast sequence is repeated.[30] Coasting is most efficient when the engine is not running, although some gains can be realized with the engine on (to maintain power to brakes, steering and ancillaries) and the vehicle in neutral, or even with the vehicle remaining in gear.[citation needed] Most modern petrol vehicles cut off the fuel supply completely when coasting (over-running) in gear, although the moving engine adds considerable frictional drag and speed is lost more quickly than with the engine declutched from the drivetrain.
Some hybrid vehicles are well-suited to performing the burn and coast. In a series-parallel hybrid (see Hybrid vehicle drivetrain), the internal combustion engine and charging system can be shut off for the glide by simply manipulating the accelerator. However based on simulation, more gains in economy are obtained in non-hybrid vehicles.[30]
Causes of pulse-and-glide energy saving
Much of the time, automobile engines operate at only a fraction of their maximal efficiency, resulting in lower fuel economy (or what is the same thing, higher specific fuel consumption (SFC)).[31] Charts that show the SFC for every feasible combination of torque (or Brake Mean Effective Pressure) and RPM are called Brake specific fuel consumption maps. Using such a map, one can find the efficiency of the engine at various rpms, torques, etc.
During the pulse (acceleration) phase of pulse and glide, the efficiency is near maximal due to the high torque and much of this energy is stored as kinetic energy of the moving vehicle. This efficiently-obtained kinetic energy is then used in the glide phase to overcome rolling resistance and aerodynamic drag. In other words, going between periods of very efficient acceleration and gliding gives an overall efficiency that is usually significantly higher than just cruising at a constant speed. Computer calculations have predicted that in rare cases (at low speeds where the torque required for cruising at steady speed is low) it's possible to double (or even triple) fuel economy.[30]
These two- or three-fold improvements in fuel economy are possible only at city driving speeds of say 25 or 35 miles/hour. This is because cruising (steady speed) at such low speeds is very inefficient since the torque needed is so low that the efficiency read on a BSFC map is very poor. Pulse and glide significantly improves this. Unfortunately, city driving often involves many stops at signals and stop signs which were absent in the computer simulation which showed such multiple fold improvements. In other words, in the real world one is unlikely to see fuel efficiency double or triple. Such a failure is due to signals, stop signs, and considerations for other traffic; all of these factors interfering with the pulse and glide technique. But improvements in fuel economy of 20% or so are still feasible.[30][32]
Pulse and Glide(PnG) is also known as Burn and coast. This method consists of rapid acceleration to a given speed (the "burn" or "pulse"), followed by a period of coasting down to a lower speed, at which point the burn-coast sequence is repeated.[30] Coasting is most efficient when the engine is not running, although some gains can be realized with the engine on (to maintain power to brakes, steering and ancillaries) and the vehicle in neutral, or even with the vehicle remaining in gear.[citation needed] Most modern petrol vehicles cut off the fuel supply completely when coasting (over-running) in gear, although the moving engine adds considerable frictional drag and speed is lost more quickly than with the engine declutched from the drivetrain.
Some hybrid vehicles are well-suited to performing the burn and coast. In a series-parallel hybrid (see Hybrid vehicle drivetrain), the internal combustion engine and charging system can be shut off for the glide by simply manipulating the accelerator. However based on simulation, more gains in economy are obtained in non-hybrid vehicles.[30]
Causes of pulse-and-glide energy saving
Much of the time, automobile engines operate at only a fraction of their maximal efficiency, resulting in lower fuel economy (or what is the same thing, higher specific fuel consumption (SFC)).[31] Charts that show the SFC for every feasible combination of torque (or Brake Mean Effective Pressure) and RPM are called Brake specific fuel consumption maps. Using such a map, one can find the efficiency of the engine at various rpms, torques, etc.
During the pulse (acceleration) phase of pulse and glide, the efficiency is near maximal due to the high torque and much of this energy is stored as kinetic energy of the moving vehicle. This efficiently-obtained kinetic energy is then used in the glide phase to overcome rolling resistance and aerodynamic drag. In other words, going between periods of very efficient acceleration and gliding gives an overall efficiency that is usually significantly higher than just cruising at a constant speed. Computer calculations have predicted that in rare cases (at low speeds where the torque required for cruising at steady speed is low) it's possible to double (or even triple) fuel economy.[30]
These two- or three-fold improvements in fuel economy are possible only at city driving speeds of say 25 or 35 miles/hour. This is because cruising (steady speed) at such low speeds is very inefficient since the torque needed is so low that the efficiency read on a BSFC map is very poor. Pulse and glide significantly improves this. Unfortunately, city driving often involves many stops at signals and stop signs which were absent in the computer simulation which showed such multiple fold improvements. In other words, in the real world one is unlikely to see fuel efficiency double or triple. Such a failure is due to signals, stop signs, and considerations for other traffic; all of these factors interfering with the pulse and glide technique. But improvements in fuel economy of 20% or so are still feasible.[30][32]
Last edited by Lavrishevo; 04-30-14 at 10:40 AM.
#42
Just an update. Excellent mileage. I'm really happy with how she is doing. Like wine. Getting better with age.
Drove 35 miles from gas station to my home:
Highway average:
Tank average that includes 3 miles from the gas station to my on ramp with multiple red lights:
Drove 35 miles from gas station to my home:
Highway average:
Tank average that includes 3 miles from the gas station to my on ramp with multiple red lights:
Last edited by Lavrishevo; 06-26-15 at 07:36 PM.
#44
Next good round trip I will measure it this way. I find I get the better mileage between 70 - 75 mph. It seems to drop a little at between 55 - 65 mph. I don't tend to drive long trips. I usually fly. Right around 2k rpms is ideal efficiency in my experience.
Also, very little wind tonight. I don't think this played a factor. Well, at least no headwind to reduce my mileage.
Also, very little wind tonight. I don't think this played a factor. Well, at least no headwind to reduce my mileage.
Last edited by Lavrishevo; 06-26-15 at 07:52 PM.
#45
Hey Tom,
So I did take a trip from Atlanta to Macon, GA. 82 miles each way this weekend. My highway average from onramp to exit was 29.2 going down and 29.8 coming back. 70 mph was my average as this seems to give me the best mileage I can get out of her.
So I did take a trip from Atlanta to Macon, GA. 82 miles each way this weekend. My highway average from onramp to exit was 29.2 going down and 29.8 coming back. 70 mph was my average as this seems to give me the best mileage I can get out of her.