- #31
xxChrisxx
- 2,056
- 85
Define what you mean when you say lean. Unless we are discussing from a common reference point using the same definitons everything is pointless.
Fuel Efficiency: Car #1 vs Car #2 | Ask an Expert
- Context: Automotive
- Thread starter PookAir
- Start date
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- Tags
- Efficiency Fuel
Click For Summary
Discussion Overview
The discussion centers on the fuel efficiency of two identical cars operating at 2000 RPM, one in 4th gear and the other in 3rd gear. Participants explore how gear selection affects fuel consumption, particularly on level ground, and consider the implications of driving uphill or downhill.
Discussion Character
- Debate/contested
- Technical explanation
- Exploratory
Main Points Raised
- Some participants argue that the fuel consumption rate depends on the speeds of the two cars, suggesting that without knowing the speeds, the question cannot be accurately answered.
- Others contend that fuel consumption per minute is the focus, and that the car in 3rd gear may have a more favorable fuel economy due to lower engine load and vacuum considerations.
- One participant proposes that the car in 4th gear will likely consume more fuel per minute because it will be traveling faster at the same RPM, thus requiring more power to overcome aerodynamic drag.
- Another participant introduces the concept of pumping losses at low loads, suggesting that these losses could affect fuel efficiency, although they believe this is not significant at 2000 RPM in either gear.
- Some participants highlight the importance of air resistance and its impact on fuel consumption, particularly at higher speeds.
- There are discussions about the effects of driving uphill or downhill, with some suggesting that uphill driving would reduce the difference in fuel consumption between the two gears.
- Participants express differing views on the relevance of throttle angle and load conditions in determining fuel efficiency.
Areas of Agreement / Disagreement
Participants do not reach a consensus on the relationship between gear selection and fuel consumption. Multiple competing views remain regarding the impact of speed, load, and aerodynamic drag on fuel efficiency.
Contextual Notes
The discussion includes assumptions about the conditions under which the cars are operating, such as the effects of speed and load on fuel consumption, which remain unresolved. There is also a lack of clarity on the specific scenario being analyzed.