Terrible MPG on my Corvette!

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Originally Posted By: Patman
Originally Posted By: Jarlaxle
I'm not sure a 6-speed Corvette is in high gear even at 55mph.


At 55mph in my 6 speed Corvette the engine is only turning at about 1200rpm


Mine has the 4 speed auto (4L65e) and the tach is sitting right on 1500 rpm at 55 mph.
 
Originally Posted By: Jarlaxle
Originally Posted By: Patman
Originally Posted By: Jarlaxle
I'm not sure a 6-speed Corvette is in high gear even at 55mph.


At 55mph in my 6 speed Corvette the engine is only turning at about 1200rpm


Which is lugging!


Absolutely not. With the amount of low end torque the LS2 has, it can cruise along all day at that speed on flat roads. Instead of gearing down, I will often accelerate lightly from as low as 1000 rpm in 6th if traffic slows down on me on the highway and then speeds back up again. The engine never complains.
 
Originally Posted By: Jarlaxle
Remind me to never buy a standard-shift car you ever drove...


Why not? I just told you the engine isn't lugging. Have you ever driven an LS2 or LS3 Corvette with a 6 speed?? If not, then you have no right to tell me I don't know how to drive my own car.
 
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Originally Posted By: Patman
Originally Posted By: Jarlaxle
Remind me to never buy a standard-shift car you ever drove...


Why not? I just told you the engine isn't lugging. Have you ever driven an LS2 or LS3 Corvette with a 6 speed?? If not, then you have no right to tell me I don't know how to drive my own car.


Yep, you must need driving lessons. I heard it on the internet!

My sig car will routinely take a corner at 900 rpm and pull right away in 4th gear. Never any protesting. "Lugging" is hardly applicable to anything modern...
 
The '97 SLS I used to own would cruise all day at 1000-1100 rpm in 4th gear at 45-50 mph. It obviously had an automatic, so if GM felt that that was a dangerous RPM to sustain, the transmission would be programmed to downshift.
 
Originally Posted By: Patman
Originally Posted By: Jarlaxle
Remind me to never buy a standard-shift car you ever drove...


Why the F not? I just told you the engine isn't lugging. Have you ever driven an LS2 or LS3 Corvette with a 6 speed?? If not, then you have no right to tell me I don't know how to drive my own car.


Anyone (e.g., Jarlaxle) who thinks lugging is solely a function of engine RPM is ignorant and not qualified to speak on this topic. Could you lug your LS2 at 1200 RPM? Of course. All you'd have to do is load the engine such that it could not meet the torque demand placed on it at that RPM, and voila, you've got lugging. If cruising on level roads at 1200 RPM, or even accelerating slightly, doesn't tax the engine beyond the torque it's producing at that RPM, then it's not lugging.
 
Originally Posted By: G-MAN

Anyone (e.g., Jarlaxle) who thinks lugging is solely a function of engine RPM is ignorant and not qualified to speak on this topic. Could you lug your LS2 at 1200 RPM? Of course. All you'd have to do is load the engine such that it could not meet the torque demand placed on it at that RPM, and voila, you've got lugging. If cruising on level roads at 1200 RPM, or even accelerating slightly, doesn't tax the engine beyond the torque it's producing at that RPM, then it's not lugging.


Yep, and that's exactly my point, on perfectly flat roads, this engine has no problems whatsoever accelerating slowly in 6th gear at 1000rpm. It's still way above the idle speed of 600rpm for instance, and I've certainly been driving high powered manual transmission cars for long enough to know when a downshift is necessary. I definitely wouldn't be giving it full throttle in 6th at 1000rpm, nor would I even be giving it half throttle for that matter. And if I was climbing even a slight incline, I would most definitely be downshifting to 5th or even 4th gear as opposed to being in 6th at that speed. FWIW, I would never be giving it full throttle at any speed in 6th gear, or even 5th gear for that matter. I've been driving manual equipped cars for over 30 years now, this ain't my first rodeo.
 
Originally Posted By: G-MAN
I took my first long weekend getaway in my "new to me" 2005 Corvette this past weekend. I put about 1200 miles on the car, most of it Interstate with the cruise set at 70, but a fair amount of rural and around town driving. For the entire trip, the car only averaged 25.8 mpg. For a 6.0 liter V8 putting out 400 HP I think this is ridiculous. I'm extremely disappointed.
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The engine isn't putting out 400 hp at 1500 rpm though.
 
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