Circumference is almost the same - the narrower tires would show 64.8 mph where the old ones showed 65. So the computed distance travelled would actually be a tiny bit less. So going strictly on the math, the MPG would show less on the SG.
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I know it's just one trip, so it's probably not all that accurate
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You said it!
It's tough to resist drawing conclusions from MPG readings that are going to vary normally anyway.
Especially after doing a mod.