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  #1  
Old 05-20-2013, 09:05 PM
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gas mileage 5.7L

'99 5.7L extended cab 4x4. What kind of gas mileage is realistic for this truck? Guy told me he'd gotten 23mpg on the highway, that sounds unrealistic to me
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Old 05-22-2013, 10:51 AM
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Re: gas mileage 5.7L

I would say that is optimistic at best. A C1500 std cab is rated 17 mpg highway by EPA. Add 4wd and the extended cab weight and it drops to 16 mpg.

The only way I see of even approaching that is by driving at the lowest speed possible to be in O/D and full TC lockup (usually around 50 mph), no A/C running (or removed), tires fully inflated, no cargo, and a cool day. You might hit 20 mpg.
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Old 05-23-2013, 06:37 PM
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Re: gas mileage 5.7L

that's what I was thinking. I found the original sales sticker in the glovebox and it is rated at 17hwy.
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Old 05-23-2013, 08:26 PM
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Re: gas mileage 5.7L

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Originally Posted by gw84 View Post
that's what I was thinking. I found the original sales sticker in the glovebox and it is rated at 17hwy.
If it is the 5.7L in a 1500 4X4 you should get about 17 MPG max If You are LUCKY.

If you have the 5.3L engine you can get 18-19 mpg in the warm weather with 4X4.

max speed of 70MPH ...over that the MPG drops quickly.

I just did a trip to Maryland got 18.5 MPG. 70 MPG most of the way. 2000 1500 4X4 LT ext cab....
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Old 05-25-2013, 06:53 PM
jamesslcx jamesslcx is offline
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Re: gas mileage 5.7L

When I had mine I could get about 18 max on the interstate. I changed all the fluids to synthetic, K&N air filter and 35 psi in tires. Oh yea, 5w30 oil in the crankcase. Best I could get out of it.
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Old 05-28-2013, 01:01 PM
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Re: gas mileage 5.7L

If he swears by getting 23 then I'd suspect speedo/odometer error due to aftermarket tires/rims and/or he swapped to different gear ratios in the differentials.
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Old 05-28-2013, 03:36 PM
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Re: gas mileage 5.7L

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If he swears by getting 23 then I'd suspect speedo/odometer error due to aftermarket tires/rims and/or he swapped to different gear ratios in the differentials.
my guess is the guy is bad in math.
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Old 05-28-2013, 05:41 PM
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Re: gas mileage 5.7L

If he swears by getting 23 then I'd suspect speedo/odometer error due to aftermarket tires/rims and/or he swapped to different gear ratios in the differentials.
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