OK this week I did a little experiment. I have a manual and I've been driving real economical starting sunday. I keep myself from getting pass 2500RPM and try to press on the cluth and go into neutural as much as possible going downhill or if I can any change I get to get my RPM as low as possible and I find that my gass mileage improve ALOT!........after 4 days my Tank is only 1/2 empty usually by day 4 with my fast driving the tank would be down to 1/3 if not worst 1/4.
The downside is that I really need to concentrate most of the time and the car will never go over 60mph to keep it under 2500rpm
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