Hey Uncle, I was chasing the elusive 70 mpg some time ago. Then a few things happened. I have kind of sobered up after that, and am taking it easy.
You have done quite well for yourself, and I envy your hardware resourcefulness. An automatic to manual swap would be something unheard of in India, where AT cars are considered as something luxurious and are charged a premium of $1k to $2.5k over manuals. Crazy world!
I had hit 55 MPG occasionally, and 50 MPG for a long long time. But the summer here is killing, and my wife won't allow me to switch off the AC, which basically puts me out of contention. I use a 1.5L Honda City (which is a Honda Fit Aria Sedan elsewhere) with manual tranny, which is very helpful in my FE marathons.
I use P&G (EOC) quite aggressively, but a few knocks on my battery is asking me to tone it down. My ultimate goal is also 70 MPG, but I am constrained by very short trips (~5 miles one way to work & back, that's all my driving, except for occasional 40-60 miles to the nearest city for shopping.
I will keep you abreast of my status, and will also keep an eye on how you fare, as you are the only one in my ballpark (I had Piloslaw to compete with earlier, but he is now head and shoulders above my level. To be fair, he uses a diesel, and is very hands-on with aero mods. I am a dunce who only can adjust the nut behind the wheel.
Wishing you the best for your 70 MPG, and Striving for the same myself,
Regards, Hummingbird
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