Amazing MPG
 

Recently took a 300 mile trip. Temps were hovering near 100 so had the a/c cranked and assumed that mpg would take a hit. Had the cruise set at 65 and winds were calm, mostly flat terrain. When I checked the mpg when I reached my destination I couldn't believe it - the DIC showed 33.6! :willy:

I make this trip 3-4 times a year and normally get around 29-30, with a previous best of 31.5. Guess the Z06 likes the heat, at least for mpg. Original owner of an 06 with 72k trouble free miles on it (even has original battery) and it just keeps amazing me. :thumbs:

:thumbs:

I have a 450 mile trip coming up this week, Im looking forward to it also!!

I had a similar thing happen years ago - at least this is what I think you experienced.

I'm guessing you started out in the morning with a full tank. I'm also guessing the car was garaged overnight, and the garage was "relatively" cool, like not much above 70 degrees.

When you hit the heat, the gas in the tank expanded as you were driving, and you may have noticed that it seemed like the gauge was stuck towards full. That's because as you were burning gas, the gas in the tank was expanding in those 100 degree temps.

Kinda fun when it happens....:cheers:

I check my DIC mpg against the math each time I fill up, and it is usually off 2-5mpg... I don't go buy that thing at all. The basic math don't lie. lol

:iagree:There no way a car that's rated at 18 city and 24mpg on the highway is going to get 33mpg. Your DIC is off or you're running way too lean....pray for the first scenario.:eek:

Let me chime in on a recent 2000 mile trip from West Texas and once around Colorado and back. Early June, temps in the 90's mostly, flat lands and Mountains. City/Highway/75-80 on most highways. 28mpg. This is my economy car.

my DIC vs math is always 2-3 mpg optimistic, happens in this and in my old 2000 coupe.

total boggler :(

That would be a good theory, but I didn't leave until around noon and the tank was only half empty when I filled it up. Even though it was in a garage, it was in a detached garage which was quite hot when I got ready to leave.

I have checked the DIC against the math several times in the past and it has always been within 1 or 2 mpg. So even if the DIC is optimistic by a couple of mpg, it's still amazing that I got over 2 mpg more than I've ever got before and especially in those conditions. And I don't think I'm running lean - got on it pretty good a few times after the trip and it still has the power and no knock.

Just like Bonneville, you have to back it up with a return run. What was your miles/gallon on the way back home? If you were going north to south, you were going downhill and don't forget the wind factor.

That is a high number indeed.

Never thought about the gasoline expanding as it warms, but it makes sense.

Cool, I've had 8.3litres per 100km which is 33.8mpg on a similar trip :)

I did a trip from montreal to quebec city last year and averaged 32 mpg.Had the car on cruise control at 68mph.

My DIC is off by 1-2 mpg.

I have taken several 300 to 700 mile trips and my real mileage (not DIC)consistantly is around 25-26 mpg. I drive at around 75-78 mph with the cruise on. My mods are a beehive air intake and a conservative tune.
I had an 08 6spd manual LS3 coupe and got over 30 mpg several times.
I am pretty happy with anything over 25 mpg for a car with this kind of power. I remember my hot rods from the 60's and 70's getting 5-6 mpg on a good day, and they weren't as fast or comfortable. Gotta love the
ZO6!

My recent mileage...
 

...all urban driving to and from work. 19.5mpg. And my engine didn't drop an exhaust valve the whole time!

:iagree: I've had the same experience in my C5 coupe, and the C6Z. DIC is a bit generous..but eh..still not bad considering we are talking about a 505 HP car.. even getting 22mpg on the Hwy ain't too shaby.

[IMG]http://i33.photobucket.com/albums/d6...te/photo-2.jpg[/IMG]

Even if it's off a bit, I'm still good.....

If the gas pumps can be inaccurate, so can the DIC. lol

I fill up almost at the same time when I need gas, and based off of mileage I am always with in 1/2 a gallon of topping off. Each time I am off 2-5mpg from the DIC, coincidence? I don't think so.

But this isn't really a debatable topic. To each their own. :)

Thank you for making your post so easy to read!