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Originally Posted by doomz78
So would i be better off to put 6 gallons at a time versus dump the whole 20 gallons in my tank?
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The error in filling up is always the same. The smaller the volume, the larger the error will be relative to the volume of fuel. For mpg accuracy, go for the least number of fill-ups.
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Weight difference. Would this really make a big difference in fuel economy?
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In mixed driving, the effect will be marginal at best, and will get lost in the day-to-day variations.
Weight has most effect on stop-and-go (city) traffic.
But you'll have to look hard to spot the effect of losing say 50 lbs over only half a tank's distance.
I fill up when the fuel price is predicted to go up, and put off tanking when prices are predicted to drop.