I just can't believe that the Z06's 7.0L V8 puts out over 500 HP and it gets better mileage(City 19/Hwy 28) than our G's 3.5L V6. What's wrong here? I manage only 17-18MPG when I drive like a grandma. I know it's related to the current gas prices but no flame please.

 

i've gone 453 miles on 18.3 gallons, meaning i've could've made it over 500 miles.

city driving is different.. i average 20-21 mpg... approx 350-360 miles/ 16-17 gallons

the fuel economy leaf on the navi helps a lot

 

That's an impressive number, accordfreak.

The most I've driven in one tank was 360 miles on 18.7 gallons. That was 95% highway. My daily commute consists of 1-2 miles city drive until I hit the freeway @ 70MPH for 15 miles then 1-2 miles city drive again. I don't know why I'm geting such a horrible MPG number.

I had my eyes on RX8 but after reading about the pissed poor MPG(~16MPG) and low actual HP I chose the G instead. Now the RX8's poor MPG doesn't seem so low anymore. Having said that, I still love my G but wish the MPG could be improved.

One thing I do notice is that the heat from the engine bay is very hot. I can feel the heat around my legs near the pedals. The only time I feel this kind of heat inside a vehicle was when I drove a UHaul truck.

 

8's get like 14mpg, so be glad you avoided it. The centre console also heats up so much from the engine that people call it the coffee warmer.

Anyway, our car gets similar gas milage to others in it's class so I think it's fine. I was driving on the freeway a long time and was at 485miles and filled up 18 gallons. Just to point out too, it's not likely at all that anyone will hit those numbers in a Z06.

 

I believe that during normal driving conditions, the corvette engine shuts off 4 of its 8 cylinders in order to improve gas mileage. I remember reading that somewhere, but i could be wrong.

 

1. our epa ratings are like 20/27 arent they? not too far off...
2. american muscle cars have traditionally had gearing such that the engine runs slowly in top gear.... which works out well since they have a lot of torque.. not sure if the new vette is different, but it wouldnt surprise me
3. the vette's engine has double the displacement of the Gs, and produces less than double the power. on that basis alone i dont think the G's engine is inefficient

 

I usually get 18-20 mpg in city, but a recent trip of all highway driving I got 25 mpg!

The new Chevy Impala SS has a 303hp OHV V-8 and also has an EPA rating of 28 mpg. I don't know how GM is doing it! It may be cylinder deactivation. Also I think GM's OHV engines generally get better gas mileage than DOHC. That's one of the reason's they've kept the 3800 around so long.

 

The OHV engines have less parasatic loss in friction, so they do get better #'s Mileage wise, they also make less HP/Liter which usualy is a hallmark of an engine that uses fuel more efficently. Also, many of those engines cruise near their torque peak, so that also adds to cruise economy.

 

Those are also EPA estimates which are based on some fictitious unrealistic driving methods to get there. I don't think the Vette shuts down cyclinders but I could be wrong as well. I know the manuals have the dreaded 1-4 shift if you are not flooring it. None of the car magazines are ever able to achieve the EPA numbers in real world tests.

 

It doesn't shut off power to any cylinders. It gets good gas mileage on the highway because the engine is just loafing along. The big V8 barely has to work to keep the Z06 at highway speed, and the Z06 is lighter than the G.

 

Corvettes do not use DOD yet (Displacement on Demand, or in common parlence, cylinder deactivation). Their OHV engines makes gobs of torque (and big flat torque curves, too) resulting in the ability to use taller gearing and still have great performance and good gas mileage.

Both the standard Corvette (400 HP) and the Z06 (500+ HP) are not subjected to gas guzzler tax (no other 400+ HP sports car can claim this) and both achieve real world highway mileage approaching 30 mpg.

 

Holy ****...what kinda tires does it come with? I can only imagine the braking and skidpad numbers on r-compounds...wow...

 

u guys get over 400 miles? how long do u drive with the empty light on? i get like 280 at the most with the light on for a while and then fill up about 16.75 gallons. plus im getting like 15 mpg =(

 

I would credit that mileage at least partly to the 1st to 4th lockout that GM has had on it's big displacement cars for years. For those unfamiliar with the feature, the car force the shift from first all the way to fourth (skipping 2nd and 3rd) in all but certain special conditions.

 

Skip shift does help mileage for CAFE rules and probably a bit for the few who don't spend $25 (or less) to disable it for city mileage. It doesn't help one bit with the highway mileage, though. 1800 RPM at ~80mph in 6th gear takes care of that.