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Assume the same driving styles done for both Tour and Sport modes, should you get approximately the same gas mileage for both or will Sport cause any lower miles per gallon than Tour? And, if lower, why?
 

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Look on page 9-60. There is nothing listed that should affect your mileage. Babying it up to speed and should get same mpg no matter which mode.
 

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I have done a mileage test between the sport tour and eco on two trips back from Florida. In both test running on cruise at 80 I got my best gas milage in the sport mode. and it wasn't even close between the eco and sport mode. Averaged 1.7 mpg better in sport over 400 miles.
 
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I have done a mileage test between the sport tour and eco on two trips back from Florida. In both test running on cruise at 80 I got my best gas milage in the sport mode. and it wasn't even close between the eco and sport mode. Averaged 1.7 mpg better in sport over 400 miles.
Interesting! Explanations anyone?


MrG 69
Enjoying every mile in my CGM/Kalahari 7sp Z51 2LT Coupe w NPP, Nav, CF Mirrors/Spoiler and BC Roof
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I just took a trip from Rockwall TX (east of Dallas) to Burnet TX which is northwest of Austin. Total trip length of about 500 miles. I set it in Sport mode on the way down and averaged a little over 26 mpg. I set it in Tour mode for the return trip and averaged just under 25mpg. Items of note; I never used 7th gear and the driving conditions were similar in some respects. Rain and wet roads. Driving speeds ranged all over the place from stop and go traffic to 80+. I found the sweet spot where the car seems to run its best was at 80- 83mph. (the speed limit is 75mph in rural Texas).

Certainly not scientific on my part. But i was impressed with the fuel range. 400+ before i needed to refuel.
 

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Just an interesting side note, I've done similar tests in my Honda Civic on East-West trips, and noted I had better mileage going one way than I had on the return trip. I attributed this to wind direction. If you're going into a headwind one way the entire time, your mileage will suffer. In my case, it was a 2 mpg difference between the two directions. Maybe not as much as a difference in a Vette due to aerodynamics.
 

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Interesting! Explanations anyone?

Hypothesis: exhaust back pressure. In Sport mode with the performance exhaust package, you should experience less back pressure when all 4 pipes are opened.
Test: turn off the active sound management in the menus (decouple from driving mode), drive in Touring or Eco, see what you get.

Eric
 

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You also get slightly better gas mileage driving north than you do driving south (all else being equal). Why? You have to accelerate going south due to the Earth's rotation and varying distance from the axis to the point on the surface at which you are traveling. It is not a tremendous amount, but it is enough that you can measure the difference if the trip is long enough.
 
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