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Originally Posted by 4x4 blazerguy
As a retired mechanic I have never seen any gadget or spark plug etc. that improves mileage enough to even pay for themselves. I agree with the person above that talked about keeping your car tuned & serviced. I run max air in radial tires & slow down. My 93 Lumina 3.1 gets up to 30 MPG @ 65 MPH, @ 75 MPH it drops to 26 MPG. This Lumina has 245,000 miles on it.
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Well, I won't turn down the advice of a good mechanic, without hearing him out (I've been fleeced by enough mechanics to stay wary, naturally.)
So I am interested in just what the maximum inflation is for a lumina with good tires, ...38psi? 40? 45? 50?
Because I don't care if the ride is as hard as a rock if I can get more mpg out of this thing.
And while we're at it, what is the maximum load I can put in a /94 lumina? (excluding the driver)?