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well, the tahoe has the 5.3 in it and my silverado had the 6.0. I drove it around for the last few days and averaged about 17 or so it says on the dash . the silverado was getting 13 and the camaro was getting 21 or so. We really dont go anywhere and during the day im driving my work van, so it really didnt seem like it would be a big deal gas wise.
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