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#4340 of 4348 Re: Gas Milage: THE REAL STORY? [elias] by xtranaut Oct 12, 2009 (7:38 am)
Replying to: elias (Oct 12, 2009 5:24 am) Elias...so if for all these reasons I shouldn't expect to get 19 or 20 mpg, how do YOU do it? My car is completely stock and from all appearances, has been pampered. This is the kind of gas usage I would expect to get if I modded the car out.   Are you figuring your gas mileage out using the gauge or the old fashioned way. I am assuming that the gauge is pretty accurate. I used it against my own calculations when I first bought the car and it seemed to line up.   Any suggestions? Replies to this message: elias (Oct 12, 2009 1:29 pm)
#4341 of 4348 Re: Gas Milage: THE REAL STORY? (gas cap?!) by elias Oct 12, 2009 (1:29 pm)
Replying to: xtranaut (Oct 12, 2009 7:38 am) I calculate mpg the old fashioned way "distance/gallons", but remain surprised that the GTO mpg-gauge is "spot on" tank for tank, just like yours! I trust it now. I think I almost always get >20mpg for each tank because I use the car mostly for highway driving and long-distance-highway roadtrips. The car spends more than 90% of its miles on interstates & state-highways. Of the other 10%, much is actually "suburban" driving rather than "city". Suburban driving can actually yield mpg better than highway mpg for some cars! (I have a VW TDI which I drive when my drive is sure to be city-ish or stop-and-go, or snowy/icy/etc, or all three.) Ideas: -Don't be afraid to "lug" the GTO engine and let it torque the car along at 1100 rpm just like you did with your vette. - Oh, another factor. I have the 17" wheels/tires. Maybe you have 18s and they have more rolling-resistance? I inflate tires to 34 psi cold. Maybe your tires are low? Our president says "air up those tires" and I agree with him on that! - and here's one. The gas cap - maybe it's that simple! These cars eat gas caps since they don't seal/lock like typical USA caps - I guess it's a Holden thing. If your gas cap is not sealing, this will cost you massive MPG due to the fuel evaporating! You can tell if the gas cap is bad if it just keeps spinning without any ratcheting sound. The ECM on these cars will NOT necessarily throw a code due to no gas cap seal - although I understand that "OBD-something" mandated they should. - also try 87 octane and see if that saves you 10% cost without costing any mpg, like it does for me. my car runs fantastic on 87 at all temperatures but I do use premium during warm weather.
#4342 of 4348 Re: Gas Milage: THE REAL STORY? [xtranaut] by cracovian Oct 13, 2009 (6:07 am)
Replying to: xtranaut (Oct 10, 2009 1:19 pm) 16.7 - 19 HWY MPG? I doubt it... not on the stick unless you have auto and in that case your mileage is normal.   My 2004 M6 GTO had a lifetime 14 MPG but I drove it like a bat out of hell (part of the reason why I had to give it up now that I'm a Daddy) but I could get mid 20s on the highway easily at 75+ mile speeds. I was putting in regular too. Replies to this message: xtranaut (Oct 13, 2009 7:04 am) xtranaut (Oct 13, 2009 7:17 am) cracovian (Oct 13, 2009 12:02 pm)
#4343 of 4348 Re: Gas Milage: THE REAL STORY? [cracovian] by xtranaut Oct 13, 2009 (7:04 am)
Replying to: cracovian (Oct 13, 2009 6:07 am) ELIAS...CRACOVIAN... Thanks for the input..although, as you see, there is still a slight difference of opinion as to what the GTO will do without effort in terms of gas mileage. With mine, unfortunately, there is little effort in getting bad gas mileage and not the other way around, as with my vette.   I absolutely love this car as much as I did the vette and the interior is even better. I put a Pioneer Nav with about every bell and whistle you can get. It fit right in the Blauplunkt radio slot and looks like factory.   My car is an A4 and runs strong. I have been a bit worried since I read about the tire shredding issue with the way they put wider tires on the car that rub the struts. I have the original tires and wheels on the car..17s..although I don't much like them. I don't know what I will replace them with yet but for sure, something quieter than these BFGs. They sound like truck tires.   It doesn't help that my car didn't come undercoated to deaden some of the road noise. I am also in Houston where everything is concrete so you note every little variance in the grading as you drive.   I found a chip made by VOLO that seems to be the only possible legit performance-fuel economy chip that rally does anything, aside of a programmer.   http://yhst-19807630266082.stores.yahoo.net/vp12-performance-ch12.html   The VOLO says it retails for 149.95 but sells for 89.95 at the intro discount. I am thinking about getting one after I see what a few guys that bought them think.   I also noticed that before I bought the car, the dealer changed the oil and 1000 miles later, it looks to be a full quarter low. Is this normal and what kind of oil do you guys run that you find best for this car? The car doesn't smoke at all and there isn't a drop on my garage floor so ???   I am seeing more people saying that a Group 3 like Castrol GTX is the best for this car instead of synthetic. Many are also suggesting to ad a product called AUTO-RX to the oil at change and run for 3,000 miles then change and ad a small amt again. The product is ester based so isn't corrosive but cleans all the engine parts and rings.   Since my car wasn't driven that much over the almost five years the original owner had it and it was a woman, I think it could be possible that the car built up sludge from just sitting or not being run like an LS1 should be.   Your thoughts about any and all of this?
#4344 of 4348 Re: Gas Milage: THE REAL STORY? [cracovian] by xtranaut Oct 13, 2009 (7:17 am)
Replying to: cracovian (Oct 13, 2009 6:07 am) ELIAS...That sounds like my car alright. If I drive it like a GTO (but not radically) that is what I will get. I can't even imagine what these guys who mod everything are getting and my guess is they don't really car. If you have an extra 10 grand to make a 350, 500 horse, then you don't watch gas mileage.   I have an K&N in my airbox but don't have cold air....and by itself, cold air doesn't help anything. Then I would need to change the exhaust and can't get away with anything less than about $800... so there is an easy 1200. dollars to get maybe a few MPG more.   Now that the economy is tanked, I give a lot of thought on everything i do and what kind of a return it's going to give me on my mone. I figure I could make that CAI-EXHAUST money back in 18 months but its always easier to pay for the gas as you go than plunk out 1200 and not even be able to get excited! ha. Replies to this message: cracovian (Oct 13, 2009 12:02 pm)
#4345 of 4348 Re: Gas Milage: THE REAL STORY? [xtranaut] by cracovian Oct 13, 2009 (12:02 pm)
Replying to: xtranaut (Oct 13, 2009 7:17 am) The four-speed required gas guzzler tax... There's no way you can compare it to the Vette or M6 GTO, especially on the highway. It's like night and day. It will suck but at least you're .1 sec quicker I think
#4346 of 4348 mpg / mods / oil by elias Oct 14, 2009 (6:57 am)
xtranaut, i wouldn't try any mods/chips/programming without reading all about others who have tried the same things: ls2gto web site. imho your mpg can only get worse if you alter the factory programming! A4 GTOs are expected to get less mpg than M6 models, so that might be the main factor - same thing that caused the gasguzzler tax for the A4 cars...   Re oil: GM sent a letter to all owners warning them the car could burn a quart every 1k miles especially if driver does lots of high-rpm coast-downs. It also warns to check the oil every time one fills the gas tank. I don't! I change oil every 10k or 15k miles. Never had to add a quart over those 10k or 15k. Replies to this message: xtranaut (Oct 14, 2009 7:42 am)
#4347 of 4348 Re: mpg / mods / oil [elias] by xtranaut Oct 14, 2009 (7:42 am)
Replying to: elias (Oct 14, 2009 6:57 am) and again, you have to wonder ... why don't they check these things out before they allow the car to go on the market> This has turned out to be a very expensive car to own.
#4348 of 4348 strut bushing replacement by roadrunner70 Nov 08, 2009 (9:33 am)
Dear Fellow GTO owners, If you replaced your strut bushing and/or front radius arm bushing, please read my post on the strut bushing thread. Thanks, RR70

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