lol happens to the best of us, not to sweat it! I just did it on another forum yesterday as well!! lol

I'm planning on an OD tranny for the Night Train, i figure 16-18, maybe even 20 mpg should be obtainable with a 3.21 final drive ratio.

Can't say I don't worry about it but it is not my daily driver and I plan on spending money when I use it to go to an event etc. I drive a F-150 4x4 as a daily driver getting on average 11-15 so I normally do not notice the difference.

My 86 B250 was getting 3.2 MPG when I bought it. It was running alright (not great) but the carb was leaking a bit which I figured out by looking down into the front two barrels on my quadrant and could see the drips splashing onto the plate. I let it sit in the carb bucket for a few days and rebuilt it. I'm sitting at about 13 right now. Not bad since I carry hundreds of pounds of music gear in it every day. I wondered if replacing my wheel bearings prematurely might help a bit more as well as replacing my rear end oil and fixing my front Universal, which is giving it a tiny shake right now.

This is an old thread to have bounced back. But for giggles I'll note that my 1991 B250 (Mid-height raised roof) with 318TBI, stock cam, but with lightly ported heads, stock exhaust manifolds and 2.25" single exhaust gets 13-17mpg. I've gotten 18 on one tank where we drove flat out on a state highway, 45-55 the whole time. It brings in 14-15 on the interstate going 70-80. With the head and valve work I've got way more power than it did before that work was done. Maybe as much as a stock Magnum, at any rate it has plenty of juice to get me and a full crew of people and gear going. It's also worth noting I've never been one to lay off the gas pedal for fuel economy. If I want to hold speed up a grade I stomp on it, that is to say I have a bit of a lead foot and give no second thoughts about it. :-)

- Rich