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Old 02-26-2013, 11:08 AM   #111
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Quote:
Originally Posted by gtferrari View Post
My car is stock as far as engine goes. Fluids are swapped every 5k (5w20 motorcraft blend) tires are inflated to 40psi 99.9% highway -3hr commute 6min back roads. Computer Avg matches the calculated avg 30mpg @70mph. Car has 117xxx miles on the clock. Replaced the oxygen sensor with a motorcraft part from rock auto $70 shipped. 1/3 what my parts dept wanted. Gained 1mpg back with it. I cant seem to increase the mileage even when "drafting". $3.99 in michigan is killing me right now. 60xxxmiles ago i was pulling down 42mpg.
all I can think of is your motor is not working as efficiently due to less pressure from being worn out a bit. Maybe try an engine treatment with your oil. I know this helped my last vehicle with 168k on it
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Old 02-26-2013, 11:29 AM   #112
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Oh i am running a can of restore engine treatment. Ive cleaned the maf and throttle body routinely. Change plugs every 25k and fuel filter every 40k. My money is on a stretching timing chain. Ive let the ford ids do a compression/power balance test. All within spec. Im gonna hook it back up and look at the fuel trims and see where they sit.
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Old 02-26-2013, 11:45 AM   #113
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24.2 mpg. I drive mostly city. I've got heavy wheels on and like to accelerate fast.
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Old 05-06-2013, 01:05 PM   #114
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I just started tracking my fuel economy with Fuelly



Had an autocross this weekend that kind of skewed my results, lol
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Old 05-06-2013, 04:23 PM   #115
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I had a weird thing happen the other day. I filled up, cleared the trip and MPG.
Went down the off ramp, immediately put it on cruise at 67mph and went for about 3 miles. The travel was downhill, then mainly flat with a few little hills and dips.

This was the result. It just kept going up!




If it was all downhill I would understand but it was 90% flat or uphill
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Old 05-06-2013, 05:09 PM   #116
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Well, after starting fuelly I've realized that the computer is not very accurate. My actual MPG was 29.6 and the computer was giving me 31.8...
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Old 05-11-2013, 09:28 AM   #117
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38.2MPG my last tank. Commuting to and from work for 2 weeks.

If I go to my parents, the average is usually > 40.

The key to gas mileage in this car is
1) Keeping it below 55
2) Taking full advantage of DFCO
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Old 05-13-2013, 09:15 AM   #118
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Averaged 36mpg over the weekend on a road trip so that bumped my Fuelly average up to 32
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Old 05-18-2013, 08:07 AM   #119
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After the 38 MPG tank I drove to my parents and back (150 miles round trip) - got 48.6 MPG! Spent $10 on the whole trip!
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