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#1
04-11-2011, 02:17 PM
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GM 3.6 Gas Mileage
Anyone have the new 3.6 304hp V6 motor having mileage problems.
My CTS Coupe is only getting around 13mpg. Sticker says 18 local, 28 hiway. Took it back to the dealer and they say after 3-4 thousand miles it should be better. Would be ok with 15-16 but 13 sucks. Car has 1500 miles on it. |
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#2
04-11-2011, 08:25 PM
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Damn! That's some lousy mileage. Mileage usually picks up a bit after the motor has been broken in, but 13 MPG just seems like something is wrong...
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1966 GTO 1969 Lemans Convertible- F.A.S.T. legal family cruiser. 12.59 on G70-14 Polyglas tires. 1.78 60' 1969 Bonneville Safari- cross country family cruiser. . 1979 Trans Am 400, 4-speed, 4 wheel disc. View from the drivers seat racing down Atco Raceway- http://www.youtube.com/watch?v=GhYDMdOEC7A Ride along in the other lane-http://www.youtube.com/watch?v=mIzgpLtF_uw |
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#3
04-11-2011, 09:22 PM
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I've always said that the mileage ratings on new cars are higher than what you really get. And I hauled all sorts of new car from 77 to 93... thought the same thing all those years too.
3-4 thousand miles sounds like a cop-out to me Phil, just to appease your complaint. It shouldn't take that many miles to find out what your best mileage will be.
__________________
 Gary Get in, ShuT Up, Hang On! Member of the Baltimore Built Brotherhood MY GTO built 4th Week of March 1966 "Crusin' Is Not A Crime" Keep yer stick on the ice. |
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#4
04-12-2011, 07:55 AM
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I said the same thing about needing 3-4K miles. What gets me is there is a little roll/miss in the engine at idle. The dealer states nothing comes up on the computer. Am thinking it may have a bad injector or something like that. May take to another Caddy dealer and see what they say. The only thing, there is only two in my area.
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#5
04-12-2011, 10:12 AM
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Plenty of GM deals I am sure. The same motor is in the new V-6 Camaro. if the Caddy dealers can't find something amiss, maybe the Chevy dealer can help out.
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#6
04-13-2011, 07:31 AM
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There must be something wrong with it, our 2009 G8 GT with the 6.0 LS3 gets over 22 mpg highway and it weighs 4000 lbs!!!!! What trans is in the CTS 5 or 6 speed?
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Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 78 Catlina Safari, Pontiac 400 powered 77 Astre Formula, 215 Buick V-8 T-5 73 Lemans Safari, 400 4bbl 4-speed 71 Catalina Enforcer, 455 4bbl 06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed! 2012 F-150 Echo Boost (My local Ford Dealer SUX!!!) 2020 Dodge Charger Scat pack (recovered) |
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#7
04-13-2011, 07:49 AM
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my 07 G6 GTP is good for 20 mpg around town. I can easily hit 31+ mpg on a long trip. six speed automatic.
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#8
04-14-2011, 06:57 AM
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