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Yay! My 1st post and I've been here over 2 years.
Anyhoo, so far I've been my biggest mod.
Max tire pressure got me an extra 4mpg in my Jetta but only 2mpg in my golf.
An accidental side affect of a blown transmission got me 6mpg in the Jetta. I swapped mine out for 1 in the junkyard and it was geared completely different. 70mph was at 2800rpms instead of 3900rpms. I believe the old transmission was geared for autoX. The Jetta started out around 26mpg which I felt was ridiculously low. I managed to get it up to 37mpg before it died. It had almost 400k miles on it and just couldn't go any longer.
For gauges I bought a $10 obd2 Bluetooth scantool from amazon and the Torque App for android. Best purchase ever. It actually helped me get the golf on the road from having so many error codes. I'll put pics of my gauges in my garage soon.
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