The pan heater is like running a 150 watt lightbulb for a few hours every morning. For the 50 cents a month or whatever cheap price it costs to run, it's a great way to increase winter fuel economy on the cheap. It's cheaper than a $3.80 gallon of gas.
I don't think they'll do any mods to the Sonic since they have the Cruze to sell. With the diesel Cruze slated for next year as the Eco-D, they're pushing the Cruze Ecos as the fuel-efficient cars in the lineup. Making a Sonic Eco would undercut their marketing of the Cruze.
The 1.4 with a manual transmission is a great engine. My Cruze has all the power I could want, and then gets low-mid 40's for average fuel economy when the power isn't needed. Getting the slushbox knocks 3 mpg off, and it's extremely hard to recover.
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2012 Chevrolet Cruze Eco 6MT
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