Usually, the ECU reprogramming allows the turbo the spool faster and create more manifold pressure. Under 'economical' driving conditions, the MPG will remain the same.
A good 'chip' will not give you a lot of torque in 1st gear, but allow the additional torque and bhp in subsequent gears.
Getting 30mpg is a stretch, unless you are in 6th and driving a constant 55mph - with the wind! Anything above 26mpg is to be considered a bonus. Do expect above 20mpg around town if you drive like an 'old man'. But these engines really like to be above 2000 rpm to keep the oil passages clear and the temperatures in the engine block consistant.
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My back feels better when I sit in a Volvo seat
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