Improving MPG Calculation Using GPS Data

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SUMMARY

The discussion focuses on calculating fuel efficiency using GPS data, specifically comparing the calculated miles per gallon (MPG) with the actual MPG obtained at the gas pump. The user employs a GPS unit to track position data (easting, northing, altitude) and calculates various parameters such as speed, acceleration, and power. Key issues identified include the need to account for engine efficiency, work done against gravity, and the effects of drag and rolling resistance, which were not adequately included in the calculations. The consensus emphasizes the importance of using real-world fuel consumption data for accurate MPG assessment.

PREREQUISITES
  • Understanding of GPS data interpretation (easting, northing, altitude)
  • Knowledge of basic physics concepts such as work, power, and energy
  • Familiarity with vehicle dynamics, including drag and rolling resistance
  • Ability to perform calculus operations, specifically integration and differentiation
NEXT STEPS
  • Research methods for calibrating drag and rolling resistance in vehicles
  • Learn about internal combustion engine efficiency metrics and their variations
  • Explore practical experiments to measure real-world fuel consumption
  • Investigate the impact of different driving conditions on fuel efficiency
USEFUL FOR

Students in engineering or physics, automotive enthusiasts, and anyone interested in accurately measuring vehicle fuel efficiency using GPS technology.

  • #31
Any thoughts?
 
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  • #32
thinkcentre12 said:
If I was running at a constant speed would any of those 14 equations change? (The equations previous listed). I ran three more trips in traffic and that seemed to really help my percent error.
It won't change the equations, except that some simplifications may be possible. Mainly it may remove some of the effects which your equations are not allowing for (like braking, varying drag).
 

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