1999 XLT Ext. Cab 2WD w/4.2???
Senior Member
Joined: Aug 2008
Posts: 1,553
Likes: 1
From: CO
I've got the same truck as you and my low fuel light comes on after about 20 to 21 gallons have been used. It's only a 25 gallon tank, so I'm surprised your low fuel light does not come on until 24 gallons are used. Maybe you somehow got a 30 gallon tank in yours.
BTW, on our crappy California low emissions gas, I don't get anywhere near the mpg you get.
BTW, on our crappy California low emissions gas, I don't get anywhere near the mpg you get.
Senior Member
Joined: Aug 2008
Posts: 1,553
Likes: 1
From: CO
my 04 heritage 4.2L V6 5spd manual reg cab longbed got 18.9 mpg when i got it, average with hills going 55-60mph. with K&N drop in filter i got 19.9 average(same driving routes) and with a K&N 77 series cold air intake i got about 22.5-23mpg average. if you are getting an auto i would say maybe 1mpg less for everything. with ext cab maybe take off another .5mpg.
also i never had the tailgate down while driving. they say it hurts mpg anyway
my bro has an 03 ext cab V6 auto and says he gets about 20 highway but his is bone stock so it gets what its supposed to.
also i never had the tailgate down while driving. they say it hurts mpg anyway
my bro has an 03 ext cab V6 auto and says he gets about 20 highway but his is bone stock so it gets what its supposed to.