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Sedans Pontiac G8 2008 Pontiac G8
1265 messages, Last post on Jul 21, 2009 at 10:14 AM
You are in the Pontiac G8 Forum. Your Hosts are pat & karens
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Replying to: rayainsw (Nov 26, 2008 9:57 am) -mike Subaru Guru and Track Instructor |
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| FWIW, my 08 GMC Sierra SLT shows AFM engaged when cruising at 70-75 mph on anything other than uphill terrain (or driving into a stiff headwind). I'm sure it weighs quite a bit more than a G8 GT and is significantly less aerodynamic to boot (plus heavy 20-inch wheels/tires). The AFM also kicks in at speeds as low as 38 mph. Of course, all this could be affected by final drive ratio; my GMC has a 3.73 rear gear (but only a 4-speed auto). Could be a situation where driving 73 instead of, say, 76 could make a noticeable difference. | |
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The cylinder shutdown makes a big difference. In general it won't be activated at 70+ MPH except during slight downgrades. I really helps when active. I have put a total of 12 k miles on two G8s (an 08 and a 09). The 25MPG figure is fairly accurate and it is hard to get better at a reasonable speed. Funny thing, I can coax 33-34MPG easy out of my C5 vette 6 speed Manual. It is even easy to coax good city mileage out of the vette by letting it lug in a gear too high. Nobody believes these numbers but I have proved it several times. I bettered a Toyota Matrix on HW MPG once after the owner challenged me.
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Replying to: mrpushrod (Nov 27, 2008 3:49 pm) Regards, OW
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Replying to: circlew (Nov 27, 2008 6:44 pm) (if you intentionally overinflate&use the inflato-spare, and drive on the painted line on side of road, that saves another .00014 mpg.) just sayin. seriously i would be drivin a vette but gotta have the back seat so i be driving the goat-naro 05 gto, which will NEVER see 30 mpg. (i hypermiled it and it got 24.1 instead of 23.9.) but it can turn in a solid 21 along with considerable vettelike characteristics. i wanna try me a G8 V8 with stick. I'd even try a V6 G8 with stick. At this rate it seems like the only way that will happen is if that jet-leasing GM president Lyle Waggoner flies me to australia to take a test drive down under.
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Replying to: elias (Nov 28, 2008 12:31 pm) Regards, OW
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Replying to: circlew (Nov 28, 2008 1:21 pm)  Top Gear actually did a test of a GT3 v. Prius. Where they drove the Prius on the track at petty much track speeds as fast as the Prius could do the circuit. Then they ran the GT3 at the same lap times/speeds as the Prius, which was considerably less than flat out. The GT3 turned a significantly BETTER milage than the Prius. -mike Subaru Guru and Track Instructor |
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Ok, tires slightly overinflated but it is really easy to achieve 32-33MPG in the vette and better when trying hard. Personal record of 38.5MPG on a 150 mile trip (requires a truck though if you get my drift). The G8 would be a guzzler if not for the deactivation feature. We traded a town car (had lowest rear end ratio and dual exhaust) for the G8 and it did better than the G8 in our real world. But if your are a highway commuter averaging 65-70MPH believe my G8 number. It rarely fluctuates too. As far as GM goes, that is not true. I owned a 94 impala that I really liked that. I enjoy the G8. I test drove the CTS and STS, both nice cars. The STS was much better than I anticipated, especially for a family hauler. The CTS provides a nice ride/handling balance. I bet the V is a hoot but never got the pleasure. I have never been disappointed with a Northstar V8. DTS not my cup of tea though. My vette has about 30k miles on it, bought it new. It has a few rattles (removable roof and all) but it always puts a smile on my face. I rather the fun of a RWD than the steadiness of 4WD. Torque and RWD is essential for my dose of adrenalin. I drift the rear end on just about every spin I take it on. What other cars have a HUD??? GM has made some good cars and trucks, they haven't been all bad. If they go under, there goes half the cars out there that still have gut wrenching torque.
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Replying to: mrpushrod (Nov 28, 2008 6:03 pm) Yippie. -mike Subaru Guru and Track Instructor
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