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My 1997 S10 has all of a sudden take a nose dive with gas mileage. its a vortec 4.3L ZR2 package 4x4 ext cab. i know they don't get the best MPG ever but i should be getting better than 10 mpg city. the only thing i did was clean the throttle body 2 weeks ago. it was gummed up so bad, i figured i would be getting better MPG or at least better throttle response but it is the opposite here. no check engine light or anything like that. i am sure i put everything back the way it was before the cleaning. any ideas?
thanks
ricky
 

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More info please. How many miles? What type of service have you done to it? Have you changed fuel filters ever? have you changed the way that you drive?
 

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10 mpg city is too low.My mpg took about a 1.5mpg drop about 3 weeks ago(1998 Suburban 5.7-2wd),and I kinda' figure it is because of the winter blend.I think winter blends are only supposed to lose 3% which would be .5 mpg, but my drop was more like 10%.
Some of the drop might be winter gas-or a different station-but under 10 mpg is too low.
Is it just one tank,or several tanks.
Thanks,
Charlie
 
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