My4by2 17 Posted October 18, 2013 Share Posted October 18, 2013 2013 LS with the manual transmission. Just rolled passed 11,000 miles - installed K&N air filter, modified intake per this sites posts & swapped over to Mobil 1 at 10k. I'm getting a steady 42 MPG with a mix of highway (70+) & city driving. Link to post Share on other sites
psquare75 35 Posted October 22, 2013 Share Posted October 22, 2013 Hmm. 4300 miles (!). Just did 330 this past weekend up to New Hampshire from S.E. MA where I am. Including some traffic, and about 100 miles of NH mountains, avg'd 42.9 MPG there and back, cruising 70-75 on the interstates. Those hills are hell though. Link to post Share on other sites
NoSprak 17 Posted October 22, 2013 Share Posted October 22, 2013 I've been racking up the miles (and I'm not kidding) Started out at approx. 36 MPG....now I'm averaging 39-43 MPG, last tank was 41.3 I've got the manual LS so no cruise. AC on almost the entire time varied city/highway driving Average speed is about 39MPH if that helps. Mine seems to love the 55-65 MPH range. Instant typically shows 45-50 MPG at this range once I'm up to speed which is about the same as it gets doing 45. I try to keep it in 5th as much as possible since that seems to be the sweet gear for MPG and always ALWAYS shift into neutral when I see a light turn yellow or red ahead of me and coast in. The computer seems to be very accurate with the AVG MPG You might pick up a bit of mileage by leaving the car in gear when decelerating. The cars have DFCO - deceleration fuel cut off. When you let off the gas in gear, it will shut off the fuel injectors if above a certain RPM instead of using a small amount to idle. Link to post Share on other sites
stevesparky 20 Posted October 22, 2013 Share Posted October 22, 2013 How does everyone fill/ and top off the tank? This can make a big difference in MPG? Do pump your own gas, or an attendant? Do you just fill to the "click", or keep on going? How much more gas can you get in pass the "click"? Link to post Share on other sites
psquare75 35 Posted October 23, 2013 Share Posted October 23, 2013 As long as you fill it consistently, it doesn't matter. I use the same pump all the time and fill to the click. Link to post Share on other sites
Greg_E 211 Posted October 23, 2013 Share Posted October 23, 2013 I just put fuel in until the pump stops, that's enough. After more than 400 gallons my mileage should be a pretty good average. Yes sometimes I get very low and sometimes very high readings which are normally due to error with the pump shut off. In the end it all works out based on fuel used and miles driven, not entirely worried about each tank. Link to post Share on other sites
My4by2 17 Posted October 28, 2013 Share Posted October 28, 2013 42 MPG average! LS with 5-speed - non-ethanol 87 octane fuel, intake mod, K&N filter. A lot of freeway driving at 70+ with a mix of stop & go in town. Just my opinion, but think people should post the On Star reading like this to prove their mileage claims - it's VERY easy to reset the average on the gauge & make it read really high for a time. Link to post Share on other sites
psquare75 35 Posted October 29, 2013 Share Posted October 29, 2013 I don't even know how to get that. Link to post Share on other sites
Greg_E 211 Posted October 29, 2013 Share Posted October 29, 2013 Non alcohol fuel would push me way up! Link to post Share on other sites
tommyspark 24 Posted October 29, 2013 Share Posted October 29, 2013 Ya we have it here, but it's literally about a dollar more per gallon. Link to post Share on other sites
My4by2 17 Posted October 29, 2013 Share Posted October 29, 2013 Can get the On Star deal either online or by getting the app on your smart phone for free. The non-ethanol fuel here is only about $0.30 more than the ethanol fuel so not near as bad. Link to post Share on other sites
Greg_E 211 Posted October 29, 2013 Share Posted October 29, 2013 It would be interesting to run a full tank of each and see how it compares, you might very well make that $.30 back with increased mileage. Link to post Share on other sites
tommyspark 24 Posted October 29, 2013 Share Posted October 29, 2013 Ours is about a buck more per gallon, and a little bit of a ride to get to the stations that have it.... Link to post Share on other sites
Dgolden 7 Posted November 3, 2013 Share Posted November 3, 2013 Non ethanol here in the stations that has it runs about $4.99 a gallon while the normal gas runs about $3.06 at least that was the price tonight on the way home Link to post Share on other sites
21783mike 17 Posted November 15, 2013 Share Posted November 15, 2013 41 Link to post Share on other sites
21783mike 17 Posted November 15, 2013 Share Posted November 15, 2013 41 Smikster 1 Link to post Share on other sites
dkw1 1 Posted November 24, 2013 Share Posted November 24, 2013 I have 9341 miles on my Spark and get 35 city and 49 highway Smikster 1 Link to post Share on other sites
jibb3r 29 Posted November 25, 2013 Share Posted November 25, 2013 (edited) 42 MPG average! LS with 5-speed - non-ethanol 87 octane fuel, intake mod, K&N filter. A lot of freeway driving at 70+ with a mix of stop & go in town. Just my opinion, but think people should post the On Star reading like this to prove their mileage claims - it's VERY easy to reset the average on the gauge & make it read really high for a time. The car's calculator isn't very good (but closer than most!). The car/OnStar usually projects a higher MPG than what it actually is. Fuelly is calculated by miles/gallons at the pump. Which have been terrible lately, for some reason. Edited November 25, 2013 by jibb3r Link to post Share on other sites
Smikster 10 Posted November 25, 2013 Share Posted November 25, 2013 Since i've moved my AVG has been 46. but I also travel a good 80/20 now. Link to post Share on other sites
tommyspark 24 Posted December 1, 2013 Share Posted December 1, 2013 (edited) Well Eva, our LT, took her first road trip today. So I did some real world gas mileage testing. I guess some things to note first is I put the tires at 45 PSI cold. Obviously you know what I've done mod wise. If it matters, I'm currently running Valvoline Dexos approved 5W20. And use 87 Octane; not ethanol free. Oh, there were two adults, and two 7 year old boys in the car. I'd say no more than 70 lbs in the trunk. When we filled up for the test run, I reset the average speed, and MPG average. We drove 197.8 miles, and the MPG gauge was saying 38.5 MPG. I must note that while the test run, I tried my hardest to get the highest possible numbers. I used cruise control at 75 MPH, (speed limit was 70) and while accelerating at all, I did not use cruise. (if you drive an auto, you know how it likes to rev up) We made one stop at a rest stop and while re entering the interstate, I did not go over 3K RPM. We never used the defrost, or AC. No heat either. Traffic never stopped, so we did no idling. When we stopped to refill, the car said average speed of 71.4 MPH It took 5.168 gallons to fill up, giving us a real world MPG of 38.27. Not too shabby Especially for a 4 speed running 75 MPH. I'd say RPMs were 3200 average. Edited December 1, 2013 by tommyspark Link to post Share on other sites
tommyspark 24 Posted December 1, 2013 Share Posted December 1, 2013 (edited) Forgot to mention, during testing, temp ranged from 54-61 and my intake temps were never more than 3 degrees above ambient Edited December 1, 2013 by tommyspark Link to post Share on other sites
baby tires 1 Posted December 7, 2013 Share Posted December 7, 2013 34,000 miles on my LS manual Spark so far mileage seems to be 43mpg over all .........80 mph = 32-34mpg 75 mph = 37-38mpg 70 mph = 40-42mpg 65 mph = 44-45mpg 60 mph = 47-48mpg 55 mph = 50-53mpg 50 mph = who has that much time? Link to post Share on other sites
BRAVO241 2 Posted December 16, 2013 Share Posted December 16, 2013 40.2 = my best Link to post Share on other sites
mdumbrow 0 Posted December 20, 2013 Share Posted December 20, 2013 2014 LS manual average 40 mpg over 4200 miles hwy and city driving great mpg love the car not the a/c Link to post Share on other sites
WaltK 305 Posted December 20, 2013 Share Posted December 20, 2013 I must not live right, since the temperatures dropped, and we went over to winter blend, I am having trouble hanging on to 29. Too congested around my world, lights, and traffic, rarely do I hit fourth gear, auto trans, can't bitch though, that's what it is advertised at. Link to post Share on other sites
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