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YOu may know that I've been fighting insanely bad fuel economy for quite a while. I recently installed new throttle shafts, KN needles, and jets in my SU HS6 carbs, and coupled this with an M41J taken from my old 1800E.
The 1800E has a 4.30 rear, while the 130S has a 4.10 rear. It's great having an overdrive with a 4.10, but it has gotten very difficult to figure my mileage since the upgrade.
After all my brake issues, this week was the first that I took the car to work each day. I filled up my tank Monday afternoon leaving work, noted the odometer, and checked the reading again when I arrived at work Friday morning.
After 4 round trips at 30 miles each, I had logged 120 actual miles, but my odometer read almost exactly 100 miles
The difference appears to be that the odometer reads .833 miles for every actual mile traveled. Does that sound correct? That would mean I'm also traveling that much faster than my speedo registers?
So 50 mpg is really 60 mpg? It does not "feel" like I'm that far off, but I do think I'm going faster than the speedo tells me.
I had planned to avoid all this trouble by using the 1800E's gauges and rear axle in my wagon along with the M41J - a complete drivetrain transplant. it hasn't worked out that way since the wagon needs some new panels welded in before I can paint and re-assemble it.
Anyway I'm going to wait until the fuel gauge drops some more before fueling up and figuring actual mileage, but so far, I put 135 miles on the car and my gauge has just dropped to 1/2 - putting my fuel use closer to 6 gallons.
If correct, that would put me up over 20 mpg... I'm crossing my fingers...
16mpg has been my max until now...
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