Originally Posted by
Top_Fuel
I have changed my opinion on Mirage tires slightly. I do a lot of freeway driving and would advise a 5-speed owner to consider the tallest tires that will fit on the car. 185-60-15s fit with no problem. Metro has 185-65-15 on his car. They are tight up front but they fit and don't rub.
When you have tires this tall, your freeway RPMS will drop by about 200 (or slightly more in Metro's case). My car now behaves like it is a 5.5 speed. I find myself staying in 4th gear a lot longer around town. And I can cruise at 65mph at 3,000 RPMs.
I had considerably taller 38" tires on my fummins and got pretty similar fuel economy on the highway as what I get in my current stock tired dually. Both truck have the same transmissions and 3.73 gears. The ferd felt like it cruised better at 75mph where my dodge fuel economy starts to dive over 60mph.
There's gotta be a fine line where taller tires start requiring more power/higher load to keep them rolling though.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)