10-26-2010, 04:05 pm
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|  Ls3 mpg
I am new to the LS3 engine. My LS2 2007 convertible would average 28-10 MPG at 70 MPH. So far the best I have gotten from my 2011 GS convertible is about 25 MPG under the same conditions. The car only has 1500 miles. Does the MPG get better as the motor gets more mileage or is this what I can expect from the LS3?
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10-26-2010, 04:57 pm
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 Join Date: Nov 2006 Location: Ann Arbor, MI Posts: 640
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It'll come up. That engine isn't broken in. Guys in my club report 30MPG+ at 80 MPH.
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1985 Z51 4+3 trans rebuilt 5.7 TPI,(.10 over) w/ CompCams 12-262-4, 52MM Throttlebody, underdrive pulleys, reworked heads, Hypertech Thermomaster chip, & cat back exhaust
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10-26-2010, 07:28 pm
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I was reminded by my club members that the GS probably has a different rear end ratio than my 2007 base car.
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10-26-2010, 07:49 pm
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| Master Technician  Join Date: Nov 2006 Location: Washington State Posts: 1,145
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Ethanol in the fuel will have the same lower mpg results. Are both vehicles using the the same transmissions, and are they turning the same rpm's at 70 mph in top gear? | ||||||||||||||||||||
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Master Technician 20 year ASE Master Certified Tech 1998 black 6spd convertible | |||||||||||||||||||||
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10-26-2010, 08:58 pm
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10-26-2010, 09:12 pm
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| Master Technician Join Date: Nov 2006 Location: Washington State Posts: 1,145
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Not enough for a 2-3 mpg drop. Most likely fuel quality. | |||||||||||||||||||||
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Master Technician 20 year ASE Master Certified Tech 1998 black 6spd convertible | ||||||||||||||||||||||
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10-27-2010, 10:33 pm
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| Join Date: Nov 2006 Posts: 351
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corvette owner since 1959, new corvettes owned 1959, 62, 63, 64, 65,66, 97, 99, 2002, 2005, 2008 BEST VETTE YET !!!, retired race engine builder, former NASCAR tech inspector.
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10-28-2010, 02:42 am
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| Join Date: Nov 2006 Location: Ann Arbor, MI Posts: 640
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Ethanol has 60% of the energy of gasoline. 10% corn squeezins= -6% mileage. Just about the most inefficient fuel, next to hemp--and supported by the same types who skipped chemistry to get stoned... | ||||||||||||||||||||
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1985 Z51 4+3 trans rebuilt 5.7 TPI,(.10 over) w/ CompCams 12-262-4, 52MM Throttlebody, underdrive pulleys, reworked heads, Hypertech Thermomaster chip, & cat back exhaust
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10-28-2010, 09:00 am
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| Master Technician Join Date: Nov 2006 Location: Washington State Posts: 1,145
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Ethanol, as an idea for a clean earth, is right up there with hybrids and electric vehicles. We are constantly fighting driveability/mpg issues because of the quality/types of fuels. It's amazing these vehicles run as good as they do. | |||||||||||||||||||||
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Master Technician 20 year ASE Master Certified Tech 1998 black 6spd convertible | ||||||||||||||||||||||
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10-28-2010, 02:14 pm
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| Join Date: Nov 2006 Location: Ann Arbor, MI Posts: 640
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And well-proven turbo diesels and fleet CNG vehicles are largely ignored. The VW TDi gets the same mileage as the Mexican-made Ford Fusion Hybrid, but where's the press on that?? It's all wishful thinking promoted by people who were high in chemistry, physics, and math classes. | |||||||||||||||||||||
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1985 Z51 4+3 trans rebuilt 5.7 TPI,(.10 over) w/ CompCams 12-262-4, 52MM Throttlebody, underdrive pulleys, reworked heads, Hypertech Thermomaster chip, & cat back exhaust
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