I bought my wife a 1999 Carvan, 3.3, early this year. Nice van, but I was always amazed at the fuel it used. Recently I had a chance to get some decent fuel economy measurements. Lately its been 95+ degrees out, so these are with the air conditioner on high constantly:
Highway (65-75 mph) over 250 miles - 20.2 mpg
In town - 11.3 mpg
Oh, my, this sux. Me thinks its time to do something.
1.) I'm certain a new O2 would help a bunch. Since I'm concerned about the economy, should I use a Mopar sensor or will a parts store sensor be fine in this situation?
2.) Van has 100k miles. I haven't really crawled underneath, but the exhaust sounds perfect. Should I be concerned that the cat is due for replacement?
3.) Basic tune up stuff looks fairly new - wires, filteres, etc. Is there anything else I should look into replacing to better the economy?
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