How are you checking your mileage.:dontknow:only had my rt a short while driven only 1600 mi only getting 25 mi to the gal is this about right ?
It's not all the air temperature. Fuels are formulated differently in the summer and winter. In the summer, the EPA requires them to be less volatile, to reduce evaporative emissions. Less volatility means less heat capacity, which means worse fuel mileage. Much the same effect that adding that stinking ethanol has. There is a trade-off. Colder, denser air in the winter requires more fuel to achive the same air-fuel ratio, so there is a bit of a reduction in that sense. The end result is that seasonal mileage variations are a very localized effect, different for you than for me......Looking at the graph it is quite clear that in the hot summer months here, my mpg drops by about 4 mpg. In cooler months, I saw over 30 mpg. Its amazing how much difference air temperature can have on fuel economy.
It's not all the air temperature. Fuels are formulated differently in the summer and winter. In the summer, the EPA requires them to be less volatile, to reduce evaporative emissions. Less volatility means less heat capacity, which means worse fuel mileage. Much the same effect that adding that stinking ethanol has. There is a trade-off. Colder, denser air in the winter requires more fuel to achive the same air-fuel ratio, so there is a bit of a reduction in that sense. The end result is that seasonal mileage variations are a very localized effect, different for you than for me.