Quote:
Originally Posted by Nissandriver
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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I was using the cars on board trip meter. The total run was 16-20 miles for each set of tires. Ive seen some people on this forum with their scan gauges do a ONE MILE section and then mention their mpg numbers. Maybe that instant read out works for their old ice cars, but in my hybrid, definitely not. I mean I can feel the difference on rolling resistance too. Especially in the city
The main point of my test was to see if the tires make a diff on the highway. Seems like they do
I also did my usually drive to mount hood and back which is 150 miles round trip. With my winter tires, I usually averaged 48-50 mpg round trip. Yesterday with the new tires I got 55 mpg round trip. Not as quite the leap as the other test. But there are a lot of factors too during that trip like heat use, how fast I accelerate up a hill and so on.
From timberline lodge on mount hood back to Beaverton its a 79 mile drive. I reset the trip mpg from the top. Averaged 92.5 mpg back to Beaverton over that whole drive. The uphill drive is what tanked the mpg and brought the overall day average to 55