MJ, I was getting 14 out of my 02 Suburban when i first got it, I had been running 15w-40 in it. Some one told me to use 5w-30 like the manual said, i switched over and started getting 16 mpg on my next trip. I then switched over to Mobil 1 5w-30 synthetic and on our last trip to Florida, I averaged 18-19 on the highway running far faster than i care to admit
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