After reading the thread by "theholycow" about his car gaining MPG (break-in) I've decided to enlist the help of you all to figure out my little Saturn.
First of all, the details.
'96 SL2 1.9L DOHC, auto. typical saturn oil burn issue, meticulously maintained by me (I'm a maintenance man/mechanic) and running 50psi in the upgraded Kumho touring tires. Yes I know, it's not a SOHC 5-speed which is the best candidate for MPG... but I have next to nothing invested in this car.
I used to ALWAYS get 27 mpg.... recently its been a guessing game as to what my MPG will be, but I do check it every single time and
my gas log shows each and every fill up w/ nothing left out.
I've replaced the PCV valve, thermostat w/ correct temp rating, fuel filter, upgraded spark plugs w/ OEM gap, upgraded NAPA silicone plug wires, air filter, and tried a snake oil product (Lucas fuel treatment) on the basis of, I swindled my way into a $90 gift card and purchased it because it was basically free to me.
Seems to me that everytime I change something or replace an old part, my MPG decreases/fluctuates.
The coolant is fresh, the engine oil/filter gets changed every 4,000-4,500 miles (although I rarely use the same oil twice, but do generally stick to blends like High Mileage), I rarely/never use A/C, I rarely use all 4 windows (generally just crack the sunroof and a rear window to aid in circulation but reduce drag and wind noise).
The only things I haven't done that I want to do are:
warm air intake
add an addition intake air temp sensor in series to OEM one (resistance, computer reads higher, leaner mixture)
fab a grill block
What gives? Shouldn't I be in the routine 30's by now? I drive the car VERY slowly and it's not often I exceed 60mph on the interstate.
Any help/tips are appreciated.
Project84 
John
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