MTlegacygtx Posted September 19, 2006 Share Posted September 19, 2006 I am running Stage 2 with AP "91 oct map" and I get consistent 20 in town and 26.7 ave. on the interstate in Montana, through passes and up mountains ... 45mph turns at 90, etc. Link to comment Share on other sites More sharing options...
TSiWRX Posted September 19, 2006 Share Posted September 19, 2006 As with many others here, I, too, have seen, surprisingly, a gas-mileage increase since I've gone "Stage II." Many will say that this is due to tighter tune of the air-fuel curve, as well as freeing-up the exhaust side of the equation, and I would tend to agree with both. However, it should also be noted that these brothers - and myself - also constantly will remind newcomers to this level of tune that your MPG will be *highly* dependent on your driving habits. Hammer on the car at-all (i.e. as soon as that boost needle goes positive), and you'll see your gas-mileage drop like no tomorrow. On my last long road-trip, which I took this weekend, for a drive of nearly 700 total miles, I averaged nearly 27 MPG, cruising most-times at around 75 MPH. And this, mind you, was with about 100 miles of city-driving mixed-in to the equation - plus really dropping the hammer at every on-ramp and toll-booth. <-- I love Winky, my "periwinkle" (ABP) LGT! - Allen / Usual Suspect "DumboRAT" / One of the Three Stooges '16 Outback, '16 WRX, 7th Subaru Family Link to comment Share on other sites More sharing options...
AWDxBOOST Posted September 19, 2006 Share Posted September 19, 2006 take your foot off the gas Link to comment Share on other sites More sharing options...
jazzymt Posted September 19, 2006 Share Posted September 19, 2006 Yea - stage 1 = lower fuel economy all around. Stage 2 = even lower yet if you drive with a lead foot, but cruising on the interstate (nonstop) I get about 1 mpg higher fuel economy than before upgrading anything. [CENTER][URL="http://legacygt.com/forums/showthread.php?t=18504"]Subaru Plug & Play Aux-in Mod[/URL][/CENTER] [CENTER][URL="http://www.jazzyengineering.com"]www.jazzyengineering.com[/URL][/CENTER] Link to comment Share on other sites More sharing options...
VTGT Posted September 19, 2006 Share Posted September 19, 2006 I am going to do the GFXDave experiment. I am going to stay entirely under 3k rpms. I'll be Trying to shift around 2500 rpms and keep the revs as low as possible while driving. I'm hoping this will net me 18-19 mpg. I only got 14.1 mpg on my last tank (actual calculation) At least premium is only 2.38 around here :/ Link to comment Share on other sites More sharing options...
MiniStiGuy Posted September 19, 2006 Share Posted September 19, 2006 I'm with VTGT and the gas mileage but I attribute it to my rather moody foot. I love to boost and I know it so I just deal with the crappy mileage. I think the last time I looked at the avg reading it said something like 17.5 or 18.5mpg. I do mostly city driving and i average around 250miles per tank compared to when I used to commute I would get 350 per tank. Today's daily lesson: It cost to drive anything but it cost even more to drive something fun. OEM HID's Rx330 Retro Link to comment Share on other sites More sharing options...
Boostjunkie Posted September 20, 2006 Share Posted September 20, 2006 I am going to do the GFXDave experiment. I am going to stay entirely under 3k rpms. I'll be Trying to shift around 2500 rpms and keep the revs as low as possible while driving. I'm hoping this will net me 18-19 mpg. I only got 14.1 mpg on my last tank (actual calculation) At least premium is only 2.38 around here :/ $2.38/gal for premium! I almost wet myself with joy when I saw a station here where premium was $2.99/gallon. Been paying more than $3/gallon for tha past year. With regards to the low rev experiment, it works. I shifted from 1 to 2 at 2800 rpm, 2 to 3 at 2600, 3 to 4 at 2400 and 4 to 5 at around 2200. All at light throttle. More or less kept up with traffic, and got 24 mpg in the city. Did this for half a tank and got so pissed off that romped on it all the time for the last half tank. Ended up getting 20 mpg overall. Moral of the story for me is that the car is capable of decent to good mileage, but is absolutely no fun to drive when all you are trying to do is bump up the mpg's. I'll pay to play. Link to comment Share on other sites More sharing options...
lookslikeanevo Posted September 20, 2006 Share Posted September 20, 2006 i finally got 13 gallons for less than $40 today... i think it was my first Current:MY05 SWP wagon - 253/290 UP, AEM CAI, Invidia Q300, tuned@yimisport OLD: MY06 GRP - 274/314 Link to comment Share on other sites More sharing options...
Legasee Posted September 20, 2006 Share Posted September 20, 2006 yup...I got to fill up for under $3.00/gal yesterday ($2.99 to be exact )...and man was I stoked! In Taiwan now... Link to comment Share on other sites More sharing options...
ghibli99 Posted September 20, 2006 Share Posted September 20, 2006 Moral of the story for me is that the car is capable of decent to good mileage, but is absolutely no fun to drive when all you are trying to do is bump up the mpg's. I'll pay to play. I agree. Enjoy it! Otherwise, go buy a Prius. BTW, I'm sure this is posted elsewhere, but Legacy_Otaku is my friend who I invited to the SCS event so that he could ask you guys questions about the car and available mods. I plan on giving him a hard time on the boards. -Mike Link to comment Share on other sites More sharing options...
MIKEBRAVO Posted September 21, 2006 Share Posted September 21, 2006 yup...I got to fill up for under $3.00/gal yesterday ($2.99 to be exact )...and man was I stoked! $2.93 it felt like I was getting away with something:lol: If you can afford College, you probably don't need to go. Link to comment Share on other sites More sharing options...
VTGT Posted September 21, 2006 Share Posted September 21, 2006 So after 30 miles the computer is reading 15 mpg. I haven't shifted past 3k rpm in any gear. I know the computer isn't terribly accurate but it is still somesort of measurement. I was expecting it to read at least 17. Link to comment Share on other sites More sharing options...
Legasee Posted September 21, 2006 Share Posted September 21, 2006 don't forget to add a few miles/tank if you upgraded your wheelz In Taiwan now... Link to comment Share on other sites More sharing options...
eamiller Posted September 21, 2006 Share Posted September 21, 2006 Double check your vacuum lines, especially the one underneath the intercooler that goes to the manifold (look for the blue tee). You can have a vacuum leak without triggering the P0171 code. If there is a leak, the ECU will be upping the fuel correction values, which will severely degrade your fuel economy. I had the vacuum line pop off my MAP sensor without triggering a CEL, and my city fuel economy dropped from around 20 to 16-17mpg. Finally figured out the problem with some TARI datalogging. Link to comment Share on other sites More sharing options...
VTGT Posted September 21, 2006 Share Posted September 21, 2006 Double check your vacuum lines, especially the one underneath the intercooler that goes to the manifold (look for the blue tee). You can have a vacuum leak without triggering the P0171 code. If there is a leak, the ECU will be upping the fuel correction values, which will severely degrade your fuel economy. I had the vacuum line pop off my MAP sensor without triggering a CEL, and my city fuel economy dropped from around 20 to 16-17mpg. Finally figured out the problem with some TARI datalogging. I'll check that, thanks. There wouldn't be any damage i there was a vaccum leak would there? Link to comment Share on other sites More sharing options...
jagger81 Posted September 21, 2006 Share Posted September 21, 2006 I was getting numbers like that--and I still average about 260 miles per tank. By the way...I'm STOCK. I don't know if that is normal. A lot of people under the same (or worse) conditions are able to pull a lot more miles out of their gas tanks. I don't drive very aggressively, and I've tried shifting at 2-3K but that doesn't help. I've also used Shell V-Power only for the last 6 months with no real difference. I tried Marathon a few days ago and that seemed to help but not that much. I'm still right around 260-270 miles/tank. Maybe Subaru had a bad batch or something? +1 Link to comment Share on other sites More sharing options...
MiniStiGuy Posted September 21, 2006 Share Posted September 21, 2006 More info on the vacum leak please.... because my city driving is around 15-17mpg and maybe I have the leak and if so I'd love to fix it so that I may get better results out of each tank. OEM HID's Rx330 Retro Link to comment Share on other sites More sharing options...
VTGT Posted September 21, 2006 Share Posted September 21, 2006 Yeah i just checked under the hood, everything looked pretty tight. Do i need to take off the tmic to reach other vacuum hoses? Link to comment Share on other sites More sharing options...
darcas Posted September 22, 2006 Share Posted September 22, 2006 I have stage II AP Cobb, Cobb DP no cats, Lachute UP mines auto and I get 13 litres per 100 kilometers eh? Link to comment Share on other sites More sharing options...
VTGT Posted September 22, 2006 Share Posted September 22, 2006 I just thought about something else. Could a bad alignment cause me to get bad gas mileage? I think I may get a realignment and rotate the tires. This is my first time doing it and my car has 6700 miles. Link to comment Share on other sites More sharing options...
MTlegacygtx Posted September 22, 2006 Share Posted September 22, 2006 No, a bad alignment isn't going to drop it by 3mpg city. I would definitely check your vacuum around your intercooler. I knew a guy with stage 2 LGT who blew off his intercooler manifold, as discussed earlier on this thread. He noticed this 20% decrease in mpg and the car wanted to stall when it was in idle at a stop light. Are you experiencing anything like this? Maybe you just got some bad gas. Link to comment Share on other sites More sharing options...
VTGT Posted September 22, 2006 Share Posted September 22, 2006 I'm only stage one, which vacuum is it around the intercooler? Do i need to take off the intercooler to find it? Any pictures? I'm been getting 15 in the city for the last 3 tanks. Link to comment Share on other sites More sharing options...
eamiller Posted September 22, 2006 Share Posted September 22, 2006 Here's a link to the troublesome vacuum line. http://angevine.org/legacy/oops1.jpg and yes, you have to remove the TMIC to see it.. Double check the vacuum lines for the wastegate too, as they're kind of hidden.. Honestly, the best way to check is to do some datalogging for long term fuel correction. Link to comment Share on other sites More sharing options...
VTGT Posted September 22, 2006 Share Posted September 22, 2006 plan on datalogging this weekend. Link to comment Share on other sites More sharing options...
RochNY91TSI Posted September 22, 2006 Share Posted September 22, 2006 A bad alignment, while probably not enough to cause 3-4 mpg drop, can cause reduced mileage. Same can be said for improperly inflated tires (underinflated). WRT the alignment, if your rear tow is out of wack, you'll essentially be scrubbing / pulling the tires. I got my alignment corrected under warranty, stock it looked like this (I'm exaggerating, but the tow was like this): / / / / Link to comment Share on other sites More sharing options...
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