Chevrolet Sonic fuel economy: 40 MPG highway with 1.4 turbo, 6-speed manual

GM hasn't "formally" announced what the next gen Aveo/Sonic fuel consumption numbers will be.

But in a YouTube presentation of the Sonic 1.4 turbo hatchback, Margaret Brooks, GM Small Car Marketing Director, says it'll be good for 40 mpg (US).

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In terms of fuel economy, we've said that our 1.4 liter turbo is going to get 40 MPG. That is clearly our most fun to drive powertrain with 40 MPG, I don't think there's anything on the planet where you can have more fun getting 40 MPG than the Sonic.

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We'll presume that's the highway rating, though she doesn't say so.

FYI, 40 MPG (US) = 48 MPG (Imperial) = 5.9 L / 100 km

• Ford Fiesta is the current subcompact fuel economy leader (non-hybrid) in the U.S., rated at 40 MPG highway for the SFE model. That's with a 120 hp 1.6 L engine.

• Note that the Chevrolet Cruze, with the same 1.4t engine, and ~500 lbs more weight than the Sonic is rated for 42 MPG highway. (Though that's the ECO model, which has a few extra efficiency mods that the regular Cruze - and likely the Sonic - won't have.)

• 2012 Hyundai Accent - Hyundai is also competing for the MPG crown with its next gen subcompact hatch and sedan. That car, unveiled at the Montreal Auto Show last week will have a 138 hp (same as the Cruze/Sonic) 1.6L direct injection gasoline engine, and it'll probably squeeze out low 40's on the highway. In Montreal, the company is saying the Accent will be good for 4.7 L/100 km on the highway (source), which actually translates to 50 MPG (US). But that figure may represent the Canadian fuel economy test figure, which is more optimistic than the EPA's numbers.

So it looks like the Sonic will at least tie for best highway MPG in the subcompact segment... for a while.

YouTube video with Margaret Brooks' comments about the Sonic MPG:

YouTube - 2012 Chevrolet Sonic - 2011 Detroit Auto

http://www.youtube.com/watch?v=flzgdywkKoI

people with cruze's say they are getting like 38 mpg with the 1.4t, is the sonic lighter? Im sure it could manage over 40 with ease

That Funny that show 1.4 turbo & a 5 speed

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Originally Posted by Daox

GM hasn't "formally" announced what the next gen Aveo/Sonic fuel consumption numbers will be.

But in a YouTube presentation of the Sonic 1.4 turbo hatchback, Margaret Brooks, GM Small Car Marketing Director, says it'll be good for 40 mpg (US).

We'll presume that's the highway rating, though she doesn't say so.

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It's probably safe to assume that it is with a manual transmission and that it is the highway rating. As for what the city rating is, "you don't want to know".

Considering that my '09 Aveo gets 37 hwy with A/T and the A/C on, that's no big improvement. But soon as you are no longer driving at highway speeds the MPG becomes dismally disappointing.

Of course they can always invoke the ultimate, all purpose disclaimer: "Your mileage may vary". :rolleyes:

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Originally Posted by thehunterooo

people with cruze's say they are getting like 38 mpg with the 1.4t, is the sonic lighter? Im sure it could manage over 40 with ease

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It's supposedly ~500 lbs lighter than the Cruze, according to some unnamed GM person. (But they didn't say which Cruze. The Eco version is ~200 lbs lighter than ther other Cruze models.)

Aerodynamics, overdrive percentage, tire friction, and final drive ratio will play a significant role in delivering highway mileage. As with the present car– paying attention to certain key details could well pay-off in mileage improvements- picking up where the factory left off. If possible whether ordering the car new or buying a "new" used version from the dealer- specifying a wheel tire package geared towards mileage rather than outright "performance" would address the tire friction point and if approached by working the choice into the deal could mean not paying extra to do so.

Ordering the correct options- ( live in a balmy area?- consider a sunroof and no a/c ), wind-up windows, 5 speed ( didn't they announce a manual 6 speed option?), and hatchback and you would also assist the mileage quest while getting a better bargain up front. Overdrive levels would directly relate to whether the manual trans were a 5 or a 6 speed final drive would relate to the manufacturer's choice based upon the weight and engine characteristics. If following the current trend from the 2010 or 2011 model, the 4th and 5th gears having a higher overdrive ratio vs changing the final drive ratio itself ( with the similar- though not the same- results ).

Aerodynamic changes would be fairly simple. The cut-outs for the lower drive lights could be plexied over or filled in with rolled aluminum sheet. Slightly smaller ( shorter and less tall ) oem or aftermarket mirrors and relocating/shortening the radio mast and extending the belly pan ( if none is there from the factory ) would be other relatively inexpensive and easy ways to improve fuel consumption at speed. Speaking of "at speed"- in any car- say even the Prius or Insight, you are going to get "disappointing results" compared to factory claims if you regularly exceed 65mph. Tire friction, engine rpm's, and aerodynamics conspire together to decrease mileage in roughly 5% increments for every 5 mph above 55-ish-60 and increases once you get above 65-ish- 70 depending on car and drive-train type. Toyota claimed 60 mpg on past Prius models. Prius owners were up in arms with 45 mpg real world returns. Ever see an average Prius on the freeway? 70 plus is the norm. Assuming a strictly linear 5% reduction for every 5 mph increase over 55 that means a 15% reduction at 70. That equates to 51 mpg instead of 60 as an example and without taking into account the increased aerodynamic drag from each successive 5 mph jump over the previous.

Things to think about.

Steve

Ok, a quick glance at the specs (and the title of this segment!) answers some of my questions and may answer yours as well. Regarding 40 mpg and whether that is a significant move ahead or not–
Following the trend of auto makers the past 10 to 12 years yes and no. Despite adding content- gps- traction control- a/c as standard- the highway mileage has actually increased. Following the trend of the past 3 years- decreasing engine size, increasing gear numbers, improving aerodynamics, all appear to come together to allow GM to advertise 40 mpg. The downside- is this slight increase over the present Aveo despite bring out a completely new car with a different engine and drive train and more aero appearance is not a real move forward in terms of getting a direct replacement for the current car. The reason for the content"improvement" is pretty easy to decipher.
The move from amortized costs on a platform that has been largely the same for 9 years and built by a workforce that draws presumably a lower cost per unit wage means that the shift to a US built replacement almost required both a name change and a marketing shift upward that allows GM to make money. To justify that expense it's fairly standard to offer more "features" or "content" to sell the greater cost of buying.
For someone interested in buying the spiritual and low cost per mile replacement for the Aveo, the Sonic isn't it. The new Spark probably is.

Steve

thats pretty well said steve. i dont know if youve come across it, but the new aveo is also bigger and heavier as well. so while that makes those numbers "better" with those factors. the fun of a small, nimble, lightweight car is gone. now the 1.4t with the 6 speed in our body style is what i was contemplating trying, but the swap is as much as a lnf swap currently. although i am led to believe it would drop in and be plug and play for ecotec owners, wonder how the body harness pins out for etecII to ecotec aveos.

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Originally Posted by petrified.rabbit

thats pretty well said steve. i dont know if youve come across it, but the new aveo is also bigger and heavier as well. so while that makes those numbers "better" with those factors. the fun of a small, nimble, lightweight car is gone. now the 1.4t with the 6 speed in our body style is what i was contemplating trying, but the swap is as much as a lnf swap currently. although i am led to believe it would drop in and be plug and play for ecotec owners, wonder how the body harness pins out for etecII to ecotec aveos.

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I'd be really excited to see if the 1.4T is also offered in the upcoming Spark- that would be a factory version of what you propose doing with a pre-09 Aveo.

Steve

Of course, I'd have to get past that funky nose on the Spark- it would have to be a little pocket-rocket to overcome that ungainly headlamp/hoodline combination.
Steve

In fact I could easily get over the frog-like front on the Spark if they do with the production version what they did with this Euro pacecar:
GMTunerSource.com - Chevy Spark Gets Turbo Treatment for WTCC Duty
Check out the listed weight!

Steve

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Originally Posted by petrified.rabbit

thats pretty well said steve. i dont know if youve come across it, but the new aveo is also bigger and heavier as well. so while that makes those numbers "better" with those factors. the fun of a small, nimble, lightweight car is gone. now the 1.4t with the 6 speed in our body style is what i was contemplating trying, but the swap is as much as a lnf swap currently. although i am led to believe it would drop in and be plug and play for ecotec owners, wonder how the body harness pins out for etecII to ecotec aveos.

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what about adapting the turbo and exhaust and head ( and open the chambers to lower compression if this head would fit- maybe everything is different? from the 1.4 along with the electrics ) What is the lnf swap?

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Originally Posted by Avezoh

In fact I could easily get over the frog-like front on the Spark if they do with the production version what they did with this Euro pacecar:

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Oooh, nice find. I missed that tidbit first time around.

Deserves its own thread...

http://www.aveoforum.com/forum/f81/c...c-cruze-11478/

If the proposed "Z" tuner arm of Chevrolet takes off ( a poll and prompting from like-minded members here and on related boards- and then a message sent off to GM? ) would be a way to fit this combination here in the states... wonder how different the electrics/computer engine /trans package is from model to model? As an example the 1.4T/6 speed manual in a Sonic – and then the same power train in a Cruze. I understand the gearing is different between the two.
Nonetheless the package from a Sonic would be fairly appropriate on the Spark ( the gearing in the first three gears might be a bit short since it would be designed for a 500+lb heavier car- (minor alteration could come about by picking a taller wheel/tire combination ). The question would be would it pass emissions/legality in the 50 States? if not the latter- perhaps the former? What are the bore/stroke/head relations between the 1.4 and the optional 1.2 in the Spark?

Steve

Is the sonic made in Korea too. Or did they upgrade to China. :)

Built in Michigan. Petrified Rabbit would know whether the design is stateside as well.

Steve

The design is mainly Korean with some other Chevy divisions helping out. I remember reading that the Corvette engineers had a go at the suspension in the Sonic (much needed IMO, Aveo suspension is way too soft). The car is just being built here (at least for the US Sonics).