better mpg 75 or 85?
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From: WA?
Originally Posted by Lice Locket,Feb 28 2006, 11:18 AM
With my CRX, I always "cruise" at 80-85 mph to go to work,since I work really far from my house. I get a consistent 350 miles per tank (10 gallons). The trick is drafting...
C&D did the same thing with their Insight to win this fuel economy competition. They cruised 85 mph while drafting another car and got over 100 mpg.
C&D did the same thing with their Insight to win this fuel economy competition. They cruised 85 mph while drafting another car and got over 100 mpg.
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I will not profess to have any conclusive evidence one way or the other, but I did notice that no one addresses the possibility that through gearing, aerodynamics, and engine design the most efficient use of available power in the S2000 "could" be outside the traditional 45 - 55 mph guestimate for best mileage. So, the question is more "Does the S2000 get better mileage at 85 than (insert speed here)?".
Consider that it is entirely possible that the S2000 gets worse mileage at 25mph than 50mph, completely independant of drag. I agree that most cars are generally designed to return the best mileage at around 55mph, but the debate surrounding the S2000's sweet spot is a valid one.
Just my 2 cents....
Peace!
Consider that it is entirely possible that the S2000 gets worse mileage at 25mph than 50mph, completely independant of drag. I agree that most cars are generally designed to return the best mileage at around 55mph, but the debate surrounding the S2000's sweet spot is a valid one.
Just my 2 cents....
Peace!
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From: █ SF, CA █
Originally Posted by Wearyeyed,Feb 28 2006, 02:30 PM
Consider that it is entirely possible that the S2000 gets worse mileage at 25mph than 50mph, completely independant of drag. I agree that most cars are generally designed to return the best mileage at around 55mph, but the debate surrounding the S2000's sweet spot is a valid one.
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From: Poway
[QUOTE=Wearyeyed,Feb 28 2006, 02:30 PM] I will not profess to have any conclusive evidence one way or the other, but I did notice that no one addresses the possibility that through gearing, aerodynamics, and engine design the most efficient use of available power in the S2000 "could" be outside the traditional 45 - 55 mph guestimate for best mileage.
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From: Hollywood
Originally Posted by SanchothePanda,Feb 28 2006, 04:46 PM
At speeds below 40-50 mph drag does not have enough of an effect to majorly influence mileage.
Gearing: S2000 gears are already relatively short when you see "highway cruisers" running 3.07 gears or less. Shorter gears mean more revolutions which means more gas.
Engine design: Even if you can get your volumetric efficiency to increase at higher rpms, its not enough to offset the fact that you're running the engine faster and burning more fuel than if it were at lower rpms.
Answer: Lowest possible rpms (highest gear) at a constant rate of travel will net you the highest gas mileage, but the aerodynamic drag of your car will affect that mileage based on the speed you drive.
Gearing: S2000 gears are already relatively short when you see "highway cruisers" running 3.07 gears or less. Shorter gears mean more revolutions which means more gas.
Engine design: Even if you can get your volumetric efficiency to increase at higher rpms, its not enough to offset the fact that you're running the engine faster and burning more fuel than if it were at lower rpms.
Answer: Lowest possible rpms (highest gear) at a constant rate of travel will net you the highest gas mileage, but the aerodynamic drag of your car will affect that mileage based on the speed you drive.
i do know that my best tank was had going to vegas at an average speed of 85ish. i do know that on the streets (non-freeway) i don't get anywhere near that kind of gas mileage.
but, does the fact that the car is also covering twice the distance @ 80 than 40 factor in. yes, you use more energy more fuel, but you are also travelling a larger distance in the same amount of time. i don't know.
i don't have the patience anyhow to drive 40 to save gas on the freeway.
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From: Poway
Originally Posted by meth,Feb 28 2006, 04:00 PM
hey, i am not claiming to know anything about all these equations you guys are posting, nor do i know much about feul efficiency.
i do know that my best tank was had going to vegas at an average speed of 85ish. i do know that on the streets (non-freeway) i don't get anywhere near that kind of gas mileage.
but, does the fact that the car is also covering twice the distance @ 80 than 40 factor in. yes, you use more energy more fuel, but you are also travelling a larger distance in the same amount of time. i don't know.
i don't have the patience anyhow to drive 40 to save gas on the freeway.
i do know that my best tank was had going to vegas at an average speed of 85ish. i do know that on the streets (non-freeway) i don't get anywhere near that kind of gas mileage.
but, does the fact that the car is also covering twice the distance @ 80 than 40 factor in. yes, you use more energy more fuel, but you are also travelling a larger distance in the same amount of time. i don't know.
i don't have the patience anyhow to drive 40 to save gas on the freeway.
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From: Sewell, NJ
Lowest revs in the highest gear without lugging the engine, in the s2000 it is just below 40mph in 6th I believe. This puts you at the lower end of the drag spectrum and have the least amount of fuel being injected. There are too many variables to make a generalized definitive statement: uphills, downhills, wind, temperature, humidity, traffic, etc. On flat level ground with no traffic 75 will return better mileage than 85.
FYI In an automatic it is the highest possible gear with the lowest possible revs where the converter is locked up.
FYI In an automatic it is the highest possible gear with the lowest possible revs where the converter is locked up.
