2011 GMC Sierra 1500 Questions

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check engine light comes on - info panel says engine is hot but
all the instrument panels say normal - truck has 61,670 miles
on it

Front right bucket seat has something loose on the backside of the seat. I want to take off plastic panel to see what is in there. Looks like it pops off. Didn't want to tear it up as it is a nice pickup. Drives me nuts driving down the road. Love the 6.2 ,Gets better mileage than my 5.3 did. Think the 5.3 was over geared for fuel economy. Thanks

does not come on or stay on all the time just about everyday.

Speedometer quit working vehicle has only 7100 miles

I recently purhaced a GMC Serria 1500, 6.2L 403hp pickup new from a dealer. The first week using the gasoline the dealer had in it I got almost 15mpg. The subsequent 4 or 5 tanks of gasoline it gave me 14mpg acording to the average mpg gage on the vehicle computer. I made it a point to drive it conservatively. I am very happy with the vehicle performance It's a hotrod so to speak but I thought this was curious and wondered if they were possibly using regular unleaded visus 10-15% ethanal/regular unleaded fuel causing this difference.