brettacuff wrote:
I think the most significant point here is to avoid jackrabbit starts. I always accelerate slowly and take my foot off the gas as soon as I see a yellow traffic light. It saves your brakes and your gas. Nobody else around me seems to get the picture though.
I use STP gas treatment and STP fuel injector cleaner in my KJ. Not at the same time, but I alternate them at fill ups. I don't know if it increases MPG or not because I have always used them. I also run 89 octane in mine, does anybody else use midgrade?
Buy quality gas(not the cheapest found) and no need for fuel treatments.Those treatments/cleaners if used to much will cook your cats and there not cheap,about $1200+ just for the cats(OE are the best).You can use 89+ octane and will help,if towing but empty it will not(KJ only,states in manual).
There are many myths about "improving" mpg's that simply do not work or yield anything to actual make a difference.
--Running with AC on will decrease your mpg's is false,running around with the windows down uses more gas then AC does.
--Running synthetic gear oil,sure will increase your mpg's but requires 12-15k OCI's or you you will cause damage to your bearings.At the 2-3 times more costly synthetic gear oils just take the 1mpg hit and run dino gear oils and your diffs will last alot longer and save you money in the long run.
--Never rev the engine beyond 2000/2500 rpm's,completely false and after some time will actually net you less mpg's from carbon build up.Run your vehicle very hard for 30-60 mins at least once a week(or once every 2 weeks) to help keep carbon build up at a min.
--Change your fluids,filters,plugs,and such on a regular basis (maintenace schedule B,no one falls into the A catagory),does help a little for mpg's but in the long run it save you money on repairs so you have more money for gas.
--Performance mufflers and CAI's,total joke as your PCM will "learn" around them,you need to have the OE programs wiped and performance programs installed to see the full effects,which usually is less mpg's as your more likely to "get on it" more with the increase in power.
--Over inflating the tires is just plain dangerous and will not net you any increase in mpg's to notice,check your tires pressures once a week and keep them at the OEM specified pressure(for OE sized tires only).
--Drive slowly,again false as my KJ got the best highway mpg's at 78mph,would lug and bog down trying to do 65mph.Granted I now am limited to 65mph on the highway but that is due to tire size and gear ratio but my engine turns the same rpm's as it use to at 78mph before the SFA swap.