Hey, I have a 99 HX MT - I usually get 42.5 mpg weekly tanks on 2 days city 5 days hwy driving in 60 to 75 F weather No A/C.

What mpg do you get?

I don't know about your tranny problem too, maybe a Honda Tech would know.

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I drive a 1999 Honda HX MT
1993 Mazda MX6 LS
1999 Dodge Grand Caravan Sport