Got my new '21 RAV4 Hybrid Aug. 4. Has about 1,200 miles. Was getting between 52-56 mpg first few weeks! Temps cooled to about 60s-70s daytime/50s nighttime. Is this usual or unusual? Using 87 Octane (have filled up only twice, and haven't gone below 52 mpg per total fill-up! Any other 2021 RAV4 Hybrid owners getting the same mpg? THANKS!