Actually, onthis last camping trip to Horsethief Lake a couple weeks ago (no mountain travel) Lola did her usual 20 MPG.  I haven't weighed her lately, but she travels pretty full.  When she has to climb mountains she drops to 17.  This has been consistent the last two years I've owned her.  I don't go by the fuel gauge, I go by the trip meter : )
 
Ellen
Lola, '85 Vanagon ASI
 
>I also can't> imagine that you folks with your laden Westies are getting the same> efficiency as me with my virtually empty Carat.> I am sure in my case that experiences with 18+ mpg is delusional. It's a> delusion caused by a fuel sender and gauge that isn't remotely accurate.
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