Honestly, no modern 1.5 can be considered truly underpowered, nowadays.
The Mazda3 1.5 is slower to 100 km/h than the 2.0, but it has a six speed gearbox with very short gear ratios. It's peppier around town than the Civic 1.8 or even the old Civic 2.0... it has a crawl-tastic first gear for those crazy Makati parking ramps and Baguio side streets... and since it's a torque converter matic, you won't be burning the clutch packs (as on a dual clutch or dry CVT) while hanging on a hill at a stoplight.
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The Mazda3 is relatively light for its class, and the 1.5 is relatively torquey for a 1.5. No problems at all with power, except if you're trying to overtake at over 80 km/h going up Kennon road...
