I am not going to hash and rehash safety. Once upon a time reverse lamps, seat belts, air bags, ABS, turn signals, rear wipers, 3rd brake light, DRL, passenger side and rear view mirrors not to mention rear bumpers were all optional equipment on vehicles. Further back people use to walk where they needed to go or ride an animal.
If you actively use something and can not do with out, then I suggest you leave it in tact. You shouldn't do anything to your car that makes it a danger or hazard for YOU to drive.
Ive driven a lot of vehicles with 2+ wheels on it and at times no passenger or rear view mirror. With this circumstances you drive accordingly or not at all.
The only thing I used my passenger side mirror was for parking an inch against the drivers side of the big SUVS that park in the cross areas of the handicap parking places who didnt even had a handicap parking thing where I work.
The passenger side mirror seems to help more with driving around 45mph mpg and abouts. I cant see any actual benefit at 55mph. I may leave the drivers side intact unless I see a slick pair at the bone yard. I have an extra mirror on my rear view mirror since this change.
The biggest improvement to mpg is to adjust the nut behind the steering wheel.
Yes, the way you drive plays a very important role. Turning off your power steering by removing the fuse only netted me 2mpg.
Next I would say using the sidewall psi on your tires and blocking 3/4 of your lower grill.
If you use the HVAC, I suggest not using the auto feature and use the least amount of heat you need in the winter and in the summer set it to LO and use the blower speed to make the interior of your vehicle warmer or cooler.
Next to pre or grid chagrinning your IMA battery you can also do this to your accessory battery. You can get a trickle charger from harbor freight for about 6 bucks and this will help on shorter trips, much like precharging your IMA battery.
The last thing Id suggest is a phev kit. Enginer or Jack sells the guts and you supply the batteries and charger for less than a grand. His kits use 48 volts. You can use 4 12 volt deep cycle batteries and for those batteries use 4 12 volt chargers like the one mentioned above.
The nice thing about the enginer kit is that it makes the car more drivable and you can drive in the left lane, go 70 mpg and still break 50mpg.
Id also consider this if you think 5 more hp or a small turbo is in your future. At least you dont need premium fuel.
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