You're asking about improving gas mileage, but relative to what? Your only experience is apparently a test drive.
I don't know what you're comparing to, but the xB2 has a somwhat largish frontal area and a fair bit of weight, so it's appropriate to ask what you're comparing performance to? Yes, there are mods you can make to boost engine performance, but engaging those mods will cost you MPG. MPG depends heavily on your head and foot -- if you expect it regardless, forget performance! The base design tries to conserve MPG despite the driver.
Pure pricing is a very specific policy and so don't expect any heed to be taken of your desire for a lower price. Best shot for a price break is an earlier model year.
I don't know what you're comparing to, but the xB2 has a somwhat largish frontal area and a fair bit of weight, so it's appropriate to ask what you're comparing performance to? Yes, there are mods you can make to boost engine performance, but engaging those mods will cost you MPG. MPG depends heavily on your head and foot -- if you expect it regardless, forget performance! The base design tries to conserve MPG despite the driver.
Pure pricing is a very specific policy and so don't expect any heed to be taken of your desire for a lower price. Best shot for a price break is an earlier model year.