Probably at 60 it will get the 24mpg number if you want. Even my Focus with comparatively better aero starts losing mileage above 55-60mph.
Engine break in MPG
- Thread starter Bullwinkle007
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Wow, I refuse to exceed ~$20 for the average gas engine oil change in my fleet. $2/qt and $3 to $5 for a filter.
Anyway one of the few vehicles I ever purchased new was an '05 Canyon with I5 and 5sp. I saw mileage increase 0.5 to 1.5mpg with literally every tank (hand calculated) until it topped out to where it should have been.
IIRC it started in the 16's and ended with 24mpg (mostly highway) if I drove it like a grandma. But every single tank in that time was a verifiable improvement.
The onboard computer mpg is calculated based on injector flow rates........The onboard computer-generated mileage is near useless, other than for what it is, an estimate. To know what mileage you're actually getting, bust out the calculator on your phone and divide actual miles driven by actual fuel consumed. The computer generated mileage in my car is usually 3-4 (or more) mpg under the figure that doing the math returns. I'll trust a computation performed with actual real-world numbers over an estimate provided by an algorithm any day of the week. Just my opinion.
Especially the instant mpg calculation.
Very accurate....not sure what you are talking about.
There are a multitude of reasons why the numbers are off......
Look at fluid dynamics, expansion, ambient temperatures for the cause of the discrepancies.
Not the ecu.
Don't just take my word for it......
"Mark Allen, GM’s director of global energy, mass, and aerodynamics, says some inaccuracy is unavoidable. “The density of fuel varies. We have no way to measure it. Mobil might be different than Shell. Summer gas to winter gas could be a big difference.” And then there are vapor-recovery systems. With modern cars’ sealed fuel tanks, gasoline vapor accumulated in the tank is absorbed by a charcoal-filled canister. Periodically, this canister is purged by the engine. “If the weather is hot, you generate lots of purge,” says Allen. “This unmetered fuel isn’t counted by the trip computer.”
Car and Driver Aug 2013 issue
"Mark Allen, GM’s director of global energy, mass, and aerodynamics, says some inaccuracy is unavoidable. “The density of fuel varies. We have no way to measure it. Mobil might be different than Shell. Summer gas to winter gas could be a big difference.” And then there are vapor-recovery systems. With modern cars’ sealed fuel tanks, gasoline vapor accumulated in the tank is absorbed by a charcoal-filled canister. Periodically, this canister is purged by the engine. “If the weather is hot, you generate lots of purge,” says Allen. “This unmetered fuel isn’t counted by the trip computer.”
Car and Driver Aug 2013 issue
Also.....
Honda uses additional inputs to calculate trip mpg. “We look at the fuel-consumed data that comes from the engine-control computer, but we also track the float sensor measuring the fuel level in the tank,” says Raj Manakkal, chief engineer for electrical and infotainment devices. He also points out that, due to temperature changes, plastic fuel tanks can expand and contract by as much as a liter. On the Acura ILX, that yields a total variation of 4 percent.
Honda uses additional inputs to calculate trip mpg. “We look at the fuel-consumed data that comes from the engine-control computer, but we also track the float sensor measuring the fuel level in the tank,” says Raj Manakkal, chief engineer for electrical and infotainment devices. He also points out that, due to temperature changes, plastic fuel tanks can expand and contract by as much as a liter. On the Acura ILX, that yields a total variation of 4 percent.
Also, odometers and tire diameters have variances from mfgr to mfgr and from new to worn.
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So your argument for me being wrong about the computer generated number being inaccurate in the real world is that...the computer generated number is inaccurate in the real world?
Slick, hoss.
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