I don't think the 5% in sidewall height will make any difference on the fuel millage. You are better off making sure the tyres are at proper inflation levels.
When i needed the new tires i thought about switching to 60s instead of 55s because they are lot cheaper and when i looked at the spare tire it was 60 too but when i looked closly the spare is a 15 inch not 16 inch,and i dont think putting 60/16s would be a good idead i think they will rub against the chasis,if you are able to put 60/16s let everyone know.
I put 60s on mine 2 years ago and never had a problem. I had the tires rotated at Walmart and they told me that the tires were very close to the front struts. I used to drive the cat a lot on the weekends and never hit the struts. I think the 60s look better because it fills up the wheel well.
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