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I log gas mileage at:
ecomodder
cleanMPG
gassavers
I use the gas receipt to jot down miles traveled and ave MPH. Since I drive to work at 2:30 am and come home at noon, I don't log my temperature. I do duplicate that tank's notes on all 3 websites.
Wind makes a HUGE difference in MPG. Quality of gas. How you place the nozzle in the fill hose. How full you fill the tank. How fast you drive. Outside air temperature and weather conditions. All variables of course. Best thing is just to log ALL your MPG results - they will average out over time.
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