2014 Ford Fiesta with EcoBoost is the Most Fuel-Efficient Non-hybrid in America
October 30, 2013 10:01 AM
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1.0-liter EcoBoost achieves 45 mpg on the highway
Ford has officially announced that the 2014 Fiesta using the new and very small three-cylinder 1.0-liter EcoBoost engine is officially the most fuel-efficient non-hybrid vehicle in America. The little 1.0-liter engine is able to achieve 32 mpg in the city, 45 mpg on the highway, and 37 mpg combined.
Those official fuel efficiency ratings are dead on with Ford's promise of
achieving mid-40 mpg efficiency
when it first announced the tiny three-cylinder engine in November 2012. Ford says that the Fiesta is the only subcompact in its class able to deliver 45 mpg on the highway while producing over 120 hp.
Ford says that its 1.0-liter Fiesta achieves fuel efficiency of 12 mpg higher than the Honda Fit and 8 mpg higher than the Toyota Yaris on the Highway. The 1.0-liter EcoBoost Fiesta gets better fuel efficiency than some competitors’ diesel and hybrid vehicles. Ford specifically calls out the 2014 Honda Insight, which achieves 44 mpg on the highway and the 2014 VW Golf diesel with a manual transmission that achieves 42 mpg on the highway.
Despite being incredibly fuel-efficient, the 1.0-liter EcoBoost engine reduces 123 hp and 125 pound-foot of torque. The vehicle also features an overboost setting allowing the car to make 145 pound-foot of torque for up to 15 seconds.
The 2014 Ford Fiesta with the 1.0-liter EcoBoost is set to hit dealer showrooms later this year.
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10/31/2013 1:10:21 AM
I disagree. RPM is not a major factor in fuel consumption.
Engine load is.
If RPM was a major factor, motorcycles would be gas guzzlers. Last time I checked, my 2-cylinder Honda CMX250 gets 80mpg cruising at 6000RPM. The simple reason is the load on the engine is minimal because there is less weight to pull.
The reason the Fiesta is getting this phenominal fuel economy, especially compared to hybrids, is because it's a tiny car with a tiny engine and the curb weight is going to be around 2500lbs. For comparison, the Golf TDI and Honda Insight they compared it to are 4200lbs and 2900lbs respectively.
And the reason your Eclipse gets weak fuel economy compared to a Galant is because the eclipse is tuned as a sports sedan and the Galant is tuned as a family sedan. The tuning means everything. Compare numbers from a Celica to a Camry and you'll see even with the same engine, the Camry is 15% more efficient even while being 400lbs heavier.
10/31/2013 6:25:54 AM
Tuners and eco-modders can attest to engine load being the primary factor for fuel consumption, however, gearing is matched specifically to a certain engine for a reason.
Depending on the design and type, each engine has a power band which will produce optimal efficiency, and gearing is used to take advantage of that. Running anywhere outside of the power band will consume more fuel when given a constant load;
higher RPM or lower
. The dynamics narrow in at higher MPH due to air drag, internal frictions, wheel inertia, tire drag, etcetera.
See any one of many BFSC graphs available out there, such as found on the BSFC wiki:
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