Gas Mileage

[brookshadow_rc]

OK, so 3 weeks ago, I changed out my plugs and coil packs. At the time I did that, my mileage was sub 13 mpg. Since, I have seen it climb up to 13.7 to 14 mpg. The thing is, that my dashboard computer says I am getting 16-18 mpg! Is there a computer reset that I need to do since hooking back up the ECM?
Should I clean the MAF?
Still scratching my head on this one...

-Ronnie

 

[DetroitDarin]

I think what you're seeing is common. The only sure way to measure mpg is old-fashioned math. Mine reads 14mpg, I get about 12.5-13. Heavy-ass tires are to blame.

 

[brookshadow_rc]

Yep, it is the good old fashioned math that led me to scratch my head. Funny thing is, I used to be able to go almost two weeks on a tank and not it is every week.
Thank you for the response!

 

[DetroitDarin]

billions? of variables - did you math it out before the 'fix'?

 

[69Hcode]

Mine was showing about 4 tenths more than it was actually getting. Now with the tuner I get 1 to 2 tenths better than the readout. If I use performance or economy setting it seems to read lower than actual.

 

[DRS1]

Mine was showing about 4 tenths more than it was actually getting. Now with the tuner I get 1 to 2 tenths better than the readout. If I use performance or economy setting it seems to read lower than actual.

What tuner do you have, and was it worth it? I have 2003 5.4 Eddie Bauer since new.. Thanks.

 

[GAINMOB]

I have superchips cortex 1950 and its worth it on gas saver setting

 

[69Hcode]

I'm running an SCT X4 with MPT custom tuning. The cost was the same as getting it with canned tunes from other places. I definitely think it was worth it.

I think I'm going to run it on 91 performance for a couple tanks and see how it does. It seems much peppier on the performance tune.