3 ms·
In 50s cars were 15mpg in average. Today’s top tier mpg cars are over 120mpg. Order of magnitude. They are also safer, quieter, faster, cheaper in maintenance,
by keymone 8y ago
In 50s cars were 15mpg in average. Today’s top tier mpg cars are over 120mpg. Order of magnitude. They are also safer, quieter, faster, cheaper in maintenance, etc.
Technology does enable 10x improvements over half a century sometimes.
- brandmeyer 8y agoYou just compared fleet average in one time period to an extreme outlier in another time period. In reality, fleet average fuel economy has been nearly flat for four decades, with the biggest periods of movement being driven by brief excursions in the price of crude oil. Those efficiency excursions were in turn driven not by technological improvement, but by changes in the makeup of the vehicle fleets themselves (lighter cars, smaller engines). https://en.wikipedia.org/wiki/Corporate_average_fuel_economy https://en.wikipedia.org/wiki/Corporate_average_fuel_economy
- keymone 8y agoand here we're comparing "average" of supersonic flight half a century ago to a potential future outlier. i don't think i'm being outrageously unreasonable here.
- opencl 8y agoThe Concorde is not "average", it is the most fuel efficient supersonic aircraft to date by a huge margin. Yes it's kind of old but I think you are dramatically overestimating how much aircraft turbojet engines have improved in the past 40 years.
- gsnedders 8y agoWhile Concorde was efficient at supersonic cruise, it was ridiculously inefficient getting there (and this was one of the main arguments for the proposed Concorde B). Also note most aircraft capable of supersonic cruise nowadays don't use turbojets, they use low-bypass turbofans (mostly around 0.3:1).
- keymone 8y agoturbojet is not the only thing that can be improved to reach the overall 10x.