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From what I can determine the series around 65 and above are aimed mostly at the "comfort " end of the market where as the lower profiles are marketed for more "sporty" drivers and for both groups FE seems to be a lesser consideration.
Having the larger width tyres will add to the frontal profile (I thought the Astra had an air deflector just ahead of the front wheels?) but the rolling resistance side of it varies from tyre to tyre so that part is not so clear cut.
I am inclined to go with you suggestion of the 175/80-14 if you are happy with them.
HTH , Pete.
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