You
may just be chasing a non-problem.
I mean………the way you're doing your est., based on miles per tank fill, may be at fault.
Note: You said that currently:
lucky if i see 300 miles on a full tank in my 2000 eddie bauer 6 banger
Then, you said
i used to get like 325-350 on a full tank..now i dont.…
So, for some that would mean a difference of only about 1-2 gals……so, think technique…….I mean, ”How many times have you squeezed in that extra gallon in?” Or, as others have mentioned city vs. combined vs. pure highway………and, driving style………did anyone mention “winter gas?”
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So, IF a wrong assumption was made, about your technique………I apologize.
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Anyway, your method
may be somewhat sound. Though,
I’d like to see actual MPG numbers over a period of time.
Cause, I‘ve found that guys who report “high gas usage” based on how many miles they travel on a “tank full”……….is somewhat suspect.
Example………..sometimes (pure highway) I’ll get close to 380 miles on a tank full and sometimes I can barely squeak 330 miles before I get scared that I’ll run out. So, at what point did I get afraid?? When the gauge read ¼ tank or was it a hair over that ¼ tank mark?? See what I mean??? Then, the next time I fill up……. I’ll be right on again. Not to mention..……sometimes the gas attendant (in OR you can’t fill your own) will really squeeze in that extra gas……and sometimes they don’t.
Aloha, Mark
PS......look at all the different MPG figures reported by different guys from across the country (note: they gave MPG figures).....and, the tire pressue issue......and, "mods" for the most part weren't even mentioned......there is alot to think about. Do the tune up----Good luck