I read through online what can cause FC:
- Bigger wheels would be an increased body weight, and greater traction due to their increased width, both having an adverse result on the vehicle's acceleration.
- One should consider the vehicle's horsepower (hp) before deciding on upgrading the tyres. If the hp is low, it will not improve performance by enlarging the wheel size. For example, a great majority of cars in Malaysia fall into the 1.3 to 1.6 litre passenger vehicle category. Most cars in this category weigh 1 to 1.2 tons and make between 115 to 135 hp, and use 185/60R14 tyres. In these cases, some performance gains may be actualized if the tyres were changed to 185/65R14, or if the width was reduced to 175mm. However, most owners choose instead to change to 195/50R15 or even 195/55R15, which only serves to increase weight and subsequently, fuel consumption.
- Some sport rims is heavier than the standard rims. This will cause higher fuel consumption of you car.
- Inefficient driving styles result in poor fuel efficiency, which ultimately leads to higher fuel consumption. A few changes to your driving style could provide a really noticeable difference and a very important method of reducing your fuel consumption.
- The amount of vehicle fuel consumed as a result of overweight and obese passengers.
Hope this clarification may help

I think I will stick with 16 inch cause I just love my rims

Thanks for your info! I will try on yokohama series for my next change of tyres.. Planning to put sticker to my original rims. What do you guys think? Nice or fugly?
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Nice.
For 15" and 16" wheel users, do you notice the increase in torque when accelerating?
With the stock 17", car feels abit heavy during low gear.