Source: Consumer Reports
quote: I thought it was common knowledge that turbocharged engine efficiency was highly dependant on how you drive them.
quote: I thought the official MPG displayed on the sticker is determined by EPA (Environmental Protection Agency) testing.
quote: AFAIK Ecoboost works by bypassing the turbo when in eco mode so it is generally just a naturally aspirated i4 doing the work until you step on it, right?
quote: There's no magic to the Eco-boost system other than marketing with a cool buzz word.
quote: No, the EPA doesn't actually do any testing except for rare instances. What they do is come up with the procedure for testing, that all manufacturers are supposed to follow. The automaker then test the car to the EPA procedure and then submits the results to the EPA.
quote: What's the point of having the manufacturers claim fuel usage figures? As if they're not going to lie to make their cars appear more fuel efficient.
quote: but this is how society *should* work.
quote: Were the blowhards at CR actually testing 0-60 speeds at the same time they were testing fuel efficiency...?
quote: We perform our own fuel-economy tests, independent of the government's often-quoted EPA figures and the manufacturers' claims. Using a precise fuel-flow measuring device spliced into the fuel line, we run three separate circuits. One is on a public highway at a steady 65 mph. That circuit is run in both directions to counteract any wind effect. A second is a stop-and-go simulated city-driving test done at our track. The third is a 150-mile "one-day trip" using several drivers taking turns around a 30-mile loop of public roads that include a highway section, secondary roads, and rural byways. CR's overall fuel-economy numbers are derived from those three fuel consumption tests.
quote: Seems more likely blowhards on the internet are jumping to conclusions without bothering to research their assumptions.
quote: Soooo how does one directly compare the results of one test to the results of another exactly?
quote: so "YMMV" really does apply in all cases, it seems
quote: Turbos allow smaller engines that are more efficient because they have less internal friction, and the reduced weight improves overall vehicle efficiency.
quote: Turbos also produce more lower end torque so the average engine rpm is lowered, also increasing efficiency.
quote: However, the trend is toward regenerative braking which reduces some losses associated with higher curb weight, and better materials, drivetrains, and lubricants have reduced the impact of friction.
quote: High rpm operation loses significant amounts of power to frictional losses and fluid turbulence.
quote: However, the trend is toward regenerative braking
quote: CR is full of crap as usual.