It will be really close. I've owned mine for a year/13k miles now and always see 28 city/32 hwy with AC on. Always. On the highway, I maintain 80 uphill or down and all my highways runs have been up the I81 corridor through the Allegheny mountains of PA, 700 miles round trip.

Back the speed down a bit and you will probably make it. If you did it non-stop, you would really have some bragging rights.....