First, CHECK YOUR ACTUAL GAS MILEAGE!!!
I have a 1988 Turbo I bought new in late 1987. (68k original miles so far)
A stock gas tank is 18.5 gal. Original claim on sticker is 18mpg city, 23mpg hwy.
I have always averaged 20mpg since day 1. That's about 330 miles before my yellow 'low fuel' light comes on. (18.5 @ 20mpg = 370 miles) So if you drive 100 miles/day in 3 days your gettin' pretty low under good conditions.
By figuring out your actual mileage NOW before troubleshooting you may realize your not that bad (for a stock Supra). Also it will give you a more accurate benchmark so you can tell if or how much improvement you get by chasing some of the suggestions made by others in this forum. We all feel like our mileage sucks now, based on dollar amounts at the pump, but forget that and get the mpg facts. If your around 20mpg your good.
Also, keep in mind driving habits like running the air conditioner all the time, heavy on the accelerator, quick starts, lots of idle time, all effect mileage too.
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