I'd get that grill block in right away. The white colored waxed veggie boxes from the supermarket are free and waterproof for a while. They burn hot so dont put them inside the engine bay. I just throw them in and put clear packing tape around the edges to keep them in. Not beautiful, but not too bad, and very cost effective. Be careful not to block too much right away. If you are not using the A/C you can block much of that side of the air intake.
My fed VX with the shift light tells me to shift from 2nd to 3rd at 19 mph, 3 to 4 at 26 mph and 4 to 5 at 30mph under really light loads.
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