fuel milage 5.7

abogoto · October 11, 2005

how can I find out what my 1997 sierra 4x4's fuel milage was originally. I bought it at auction and it gets 9-10 MPG- I hope this is not normal? One reply was that this might be. can anyone help?

bronyaur · October 11, 2005

There are many things that can affect gas mileage. It would help to know what type of transmission you have, the gear ratio of your rear differential, and the average conditions under which the vehicle is driven. That would be a good start.

I believe a '97 Sierra 1/2-ton 4X4 with a 5.7, 4L60 transmission, and 3:73 rear end should be getting about 15mpg overall (avg. city/hwy). I have two similar vehicles and that is about what I get on both, and have since they were new.

Wingnut · October 12, 2005

Yeah, that's a few shy of what a 1/2 ton should be getting.

asepgrad98 · October 12, 2005

here ya go

billbarr100 · October 12, 2005

i get 16 - 17. My worst so far was 14.5

I have a 97 1500 ext cab 4x4 4l60 3.73

I'd start with a dealer parts tune up. Use the delco plugs and ingition stuff, filters. Make sure brakes arn't draging. Check/Change fluids. Make sure you don't have a crack in yoru intake manifold. When in doubt, take her in to get serviced and explain your gas mileage.

billbarr100 · October 12, 2005

also, www.fueleconomy.gov

d-dog · October 12, 2005

I've got a 97 Extended cab, Chev Z71, with the 5.7, 3:73, and get 14 - 15.

abogoto · October 16, 2005

Yeah, that's a few shy of what a 1/2 ton should be getting.

<{POST_SNAPBACK}>

thanks for the site- it hit the nail on the head. now just to figure out where my mpg went!

abogoto · October 16, 2005

There are many things that can affect gas mileage. It would help to know what type of transmission you have, the gear ratio of your rear differential, and the average conditions under which the vehicle is driven. That would be a good start.

I believe a '97 Sierra 1/2-ton 4X4 with a 5.7, 4L60 transmission, and 3:73 rear end should be getting about 15mpg overall (avg. city/hwy). I have two similar vehicles and that is about what I get on both, and have since they were new.

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thanks for the rply. I have the stock rated tire size on it, and a 4L60 trans, don't know the gear ratio. it is driven all hwy. the web site I was directed to stated 15/19 mpg but i'm nowhere close. since it was a wildlife and fisheries truck maybe they have a different rearend on it?

buck50 · October 16, 2005

There are many things that can affect gas mileage. It would help to know what type of transmission you have, the gear ratio of your rear differential, and the average conditions under which the vehicle is driven. That would be a good start.

I believe a '97 Sierra 1/2-ton 4X4 with a 5.7, 4L60 transmission, and 3:73 rear end should be getting about 15mpg overall (avg. city/hwy). I have two similar vehicles and that is about what I get on both, and have since they were new.

<{POST_SNAPBACK}>

thanks for the rply. I have the stock rated tire size on it, and a 4L60 trans, don't know the gear ratio. it is driven all hwy. the web site I was directed to stated 15/19 mpg but i'm nowhere close. since it was a wildlife and fisheries truck maybe they have a different rearend on it?

<{POST_SNAPBACK}>

have you checked the RPO code?

abogoto · October 18, 2005

There are many things that can affect gas mileage. It would help to know what type of transmission you have, the gear ratio of your rear differential, and the average conditions under which the vehicle is driven. That would be a good start.

I believe a '97 Sierra 1/2-ton 4X4 with a 5.7, 4L60 transmission, and 3:73 rear end should be getting about 15mpg overall (avg. city/hwy). I have two similar vehicles and that is about what I get on both, and have since they were new.

<{POST_SNAPBACK}>

thanks for the rply. I have the stock rated tire size on it, and a 4L60 trans, don't know the gear ratio. it is driven all hwy. the web site I was directed to stated 15/19 mpg but i'm nowhere close. since it was a wildlife and fisheries truck maybe they have a different rearend on it?

<{POST_SNAPBACK}>

have you checked the RPO code?

<{POST_SNAPBACK}>

I feel kind of dumb, but what's the RPO code?