I might be mistaken, but isn't your car supposed to get number like that without aerodynamic modification?
SIDE NOTE:
Last week I was stranded at the cigar lounge (
S10 would not start), one of the guys there happened to be leaving and gave me a ride to the auto store and back (NAPA).
I picked up a new distributor cap and rotor and installed it, running like a champ after struggling to get the ignition wires on in right sequence, good thing I had my Haynes book and star bit drivers on me.
My point of this short story is even though by my best estimation the cap and rotor was replaced just shy of 50,000 miles ago it was completely worn out, so much so that the truck had starting issues.
I am happy to report the 20 minute drive back home used much less gas - yes I could see just by using the gauge even though my odometer hasn't worked in about six years.
The power curve and torque I can lay down were also vastly improved.
https://www.fueleconomy.gov/feg/maintain.jsp
Quote:
Fixing a car that is noticeably out of tune or has failed an emissions test can improve its gas mileage by an average of 4%, though results vary based on the kind of repair and how well it is done.
Fixing a serious maintenance problem, such as a faulty oxygen sensor, can improve your mileage by as much as 40%.
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I suggest lifting up the distributor cap and inspecting the metal prongs that stick down. Some of mine looked like they had been filed down at a 45 degree angle, when on a new cap they are longer and straight 90 degree cut.
I suspect that on older higher mileage cars the interval between tune ups are shortened as tolerances go out of spec.