[Gunia]

I got as high as 35.7 mpg on the highway today at about 65-70 mph, 3.5L V6 (18k miles) Sedan.

I filled up the tank, reset the mpg on the radio display and hit the highway without any stops. After about 25 miles I was still getting a steady 35.7. I'll be driving down to PA tomorrow (mixed city/highway and hills), I'll post what I get.

 

[Gunia]

Ok came back from my little trip. Total miles 342.5. The radio display reads 30.1 mpg. I calculated 28.1 mpg. There is a little discrepancy, could be the method I use, but even a worst case average of 28 mpg is great.

The trip was about 70% highway (60-70 mph), 30% local (30-45 mph, lots of traffic lights, hills, no bumper to bumper traffic).

I was also using a fuel system cleaner during this trip, but I doubt that had an effect on the mpg.

I didn't check the tire pressure, but I usually have it at 33-34 psi. Engine oil and air filter was changed recently.

 

[Gunia]

WOW! 35.7 for a 3.5 by GUNIA is awesome. I drove about 25 straight highway miles after a fill up today, and got 25 MPG from my 3.9.

I still get 28 mpg with mostly highway driving in my Impala (3.8L V6). I did get an average as high as 32 mpg. The 3.9 obviously has more power, but might also have more aggressive gearing. Also if you have larger rims, that adds additional weight to rotate...not to mention the additional weight of the convertible.