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Re: 4:10 rear versus gas mileage..1999 truck
From reading post on GM-trucks.com I get that the general fuel concensus on an older truck with a 4.10 rear end is about 13-14 city and 14-16 highway. With 12-13 being a towing average. A 3.73 rear may get you 1mpg more. A lot of it depends how you drive. If you tow and drive city all day you'll get about 13 mpg, if you drive highway all the time you might get 15 as an average. Just my opinion. This board is currently more motivated by folks with older trucks, although this section is growing. For more information on newer trucks you may want to try GM-trucks.com
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