Technical some questions...please help

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Technical some questions...please help

OK, as some of you may be aware, Ive had bad fuel economy for a bit, and its reeeealy annoying me.
someone suggested timing, and this can be discovered by spark plug colour, so i took a pic of each plug:









there all labeled, any comments??

also, have changed all the sensors i deemed wort replacing, except map/maf and this one, cos i don't know what it is.....
these two pictures show my throttle body (i), is this OK?
and the sensor (ii) what is it? can it effect mpg?





any help, any comments, greatly appriciated.......
 
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plug3 looks a bit black, & 4 is not much better, but that may be a bad picture.
plugs should be grey/brown like no1....throttle/body looks like it could do with a good clean out. plugs aren't too dear to replace...getting back to the plugs black plug is usually running too rich or oily deposits worn cylinder/rings
 
if your not keeping the car change plugs, clean out the throttle body & see how you get on from there;) simple job to do i think there's a guide on here but take your time & loads of cleaning spray etc
 
wellll, im not keeping the car, but quite possibly will become my lil bro's run around, the plugs are recent....within last 3k.....also what spray should i be using??? nothing in there thats fragile? can i wipe it with rags etc...also would REALY like to fix my mprg, is this likely to? petrol is becoming a b**** 22-25mpg...#

EDIT: errrm, just remembered, that mechaninc did compression test for me about 3 months ago, and all was good, does this hint that cylinder rings are ok??
 
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by the sounds of things your a novice:D so i would let or get someone who knows what he is doing.you have to strip down the throttle body for a start:D to give it a good clean
 
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