I can’t blame Toyota for sticking with Avanza’s tried and tested powertrain. While many would scoff at the Rush’s idea of a little more than 100 horsepower than a larger hatchback, the powertrain combination is the most reliable on the market. In my experience of living in Avanza for several years, the engine and gearbox are two things that you can rely on every day, and this reliability is largely due to its simple engineering.