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What are you using to measure your mileage? Is it the car computerīs measurement? Thereīs no way I can get good reliable measurementīs for such short trips in my old cars.
Iīm curious as to how your carīs computer mileage measurements compare to what you see if you use the number miles traveled divided by the pumpīs number of gallons to refill.
As for rolling resistance, the difference can be significant. I had a 2001 Nissan Frontier XE (2.4L I4) that always got 30-31 mpg for 1-2 years. Most of the driving was 65 mph on the highway. I needed to replace the front tires so I bought two used tires. After that tire replacement I could never get the truck to average more than 28 mpg. I burned one tank never exceeding 55 mph and tried my best to increase the mileage and I still got 28 mpg. Those tires were louder too. I started paying a lot more attention to rolling resistance after that pair of tires.
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