The Weber isn't known for delivering stellar fuel ecomony. However,
since I get just under 30 in around-town driving in my 1500, it seems
that you've got a problem.
Some things to consider:
If the PO removed all the emissions stuff, check out how he dealt with
the fuel vapor return lines. You could be venting a lot of that
gasoline.
If it's jetted OK at idle, it may still be rich at speed. Webers use
different jets at different ranges.
Tire inflation. I've seen a lot of folks run the tires a few PSI soft
for comfort. If you're down a few PSI, it'll matter.
With the Weber and the header, you've moved the power (and efficiency)
up in the RPM band. With dual SUs and a header, I shift at 4,000 RPM
or higher (and pull 28 - 30 in around-town driving). Maybe you
should "thrash it" a little.
The usual tune-up stuff (air filter, spark plugs, wires, etc).
Brake Drag?
These are just guesses. If I can be of any help with specifics, give a
holler.
Chris K.
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