[V6-12v] Low Gas Mileage

[Nathan Widmyer]

Well, I have a problem with my car. I was making a 100 mile trip and by a 
calculation with an estimation of the gas levels, I'm achieving about half 
of the gas mileage I should. Now, the EGR system still trips the check 
engine light, it was on practically the entire time during that 100 mile 
trip, I still need to get that fixed but I'm not sure that would cause the 
low mileage. I talked with my dad and he says we might want to change the 
spark plugs and/or wires but then he said we might want to just take it in 
to be tuned up. Does anyone know something more specific worth checking out 
to help narrow down the problem so I can say "I need this to be replaced but 
I don't have the tools" as opposed to "it doesn't work good, fix now". I've 
archived the email discussion about the EGR system from a few months ago 
when I brought it up before. The car is a 1994 90 with everyones' favorite 
12V V6. Any help you guys can provide will be a great help, thanks a lot, 
Nathan.