what affects mpg? - Honda CRZ Forum: Honda CR-Z Hybrid Car Forums
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post #1 of 30 (permalink) Old 07-08-2012, 01:41 AM Thread Starter
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what affects mpg?

Ive heard of some engine and exhaust modifications that will decrease your mpg like for example, i read on the forums that a straight pipe axle back or muffler delete will decrease mpg due to lack of back pressure, but what are the engine mods that will increase mpg?
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post #2 of 30 (permalink) Old 07-08-2012, 01:53 AM
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From what I've read adding an intake and inflating your tires to the 40ish mark both increase mpg.
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post #3 of 30 (permalink) Old 07-08-2012, 01:58 AM Thread Starter
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i thought that tpms light will go off if the tire pressure is too far from recommended psi whether its too much air or too little. i drive in a lot of traffic and ive been getting 34 mpg average with a high of 36. is that normal
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post #4 of 30 (permalink) Old 07-08-2012, 02:01 AM
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Yes, or above 70 mph mid 30s mpg seems to be avg
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post #5 of 30 (permalink) Old 07-08-2012, 02:11 AM Thread Starter
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i have a 6 speed manual btw, and the 34-36mpg included one night of no traffic where i cruised at 70mph in econ. but man everyday its traffic. before the hour long drive i was at like 33 mpg
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post #6 of 30 (permalink) Old 07-08-2012, 11:06 AM
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Basically engine loads and intake temps effect mpg. Gasoline types too effect mpg due to density and BTUs. More air in requires more fuel and needs a bigger exhaust but having a oversize exhaust pipe will hurt mpg and power. Back pressure is needed for the EGR system to work efficient but the EGR also reduces power due to leaner mixtures.
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post #7 of 30 (permalink) Old 08-11-2012, 12:57 PM
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I'd actually written a reply in a different thread roughly covering the same things, so I will paste it here rather than rewriting it.

Quote:
Originally Posted by stumcewing View Post
I've got a K&N Typhoon and also a P2R downpipe (no aftermarket exhaust yet, but soon) and I've seen a pretty major change to be honest. The K&N gave me an extra couple of MPG's and pushed me up to 40MPG at average crusing speeds (Averaged 43.5 MPG on a run to Penn from NYC)

The P2R turned it into a monster, now during a normal run the MPG meter hovers between 45 and 55 mpg under highway conditions, car runs better and under heavy acceleration there is at least 1 more block of MPG present at all times (had 2 blocks in the bar when I had the Typhoon and the stock pipe, now it's between 3 and 4 blocks with the P2R).

Hope that helps a little bit
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post #8 of 30 (permalink) Old 08-11-2012, 05:13 PM Thread Starter
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did p2r down pipe give u check engine light
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post #9 of 30 (permalink) Old 08-11-2012, 05:26 PM
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Quote:
Originally Posted by subieguy83 View Post
did p2r down pipe give u check engine light
No the P2R will not give you a CEL..



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post #10 of 30 (permalink) Old 08-11-2012, 08:42 PM
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ethanol, sure affects mpg.....
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