^^ very interesting!!! so what you should have done is cranked up the AC and cooled the car as much as possible! In some cases AC yeilds better mileage in the hot!

i got around 20 km a liter when i drove a civic 5 spd using advanced hypermiler techniques
and now I drive a salvage nwh20 prius that gets almost to 25 km/l with 195,000 km to date.