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not to hijack the thread..........
consaka.........
a friend of mine had the same problem on almost the same year suburban....
drove him nuts, all sensors checked out ok, etc...........
his problem turned out to be the wrong sized tires............
apparantly the speed sensors on chevys the tire size will screw with stuff......
he went from 10mpg on the highway to almost 18-19 with putting on the stock sized tires........apparantly the last owner wanted "bigger" tires. Then sold it after his mileage went to crap. Check and see.......might be something simple!
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