Topic: Average MPG in rural America?
in Forum: C4 General Discussion
I see post where people state average MPG as 25-27 miles per gallon,but I get 19 average off interstate,and 21-23 on interstate 77.
The car seems to run perfect,and if I look at instant fuel rate on flat straight ground it does read 27-28 ,but on steep hills it reads 11-12 .Like I say the car runs great,and it takes very little throttle to maintain a steady speed.
I live in somewhat hilly terrain and was wondering what kind of mileage others are getting in such conditions.My car is a l98 auto 2.59 that is practically stock .Thanks
The only real distance driving I've done so far is when I bought it (1300 miles).
I got best of 32 mpg out of it on the highway at 75 driving from N.M. to Mn.
Question - why are you putting premium in your Vette? If you have the L98 as you said, it's unmodified then it should have 9.5-1 compression ratio. That should run on 87 octane regular just fine. You're not getting any benefit by running premium and actually may be hurting things because you want higher compression or something like a blower to take advantages of the characteristics of premium.
I admit that gasohol is hard on rubber parts but even if you have to fuel with non-alcohol gas for collector cars and small engines, it's still cheaper here than paying for premium. Having said all that, with a 2.59 gear ratio, I would expect yours to do very well on the highway using cruise. Now all this depends also on driving style, if you're a stoplight racer it will kill gas mileage every time.
Mine has the same compression ratio and I've been burning 87 octane in it since I bought it last year except when I put it into winter storage last fall. Then I used non-alcohol gas. It drives just fine on 10-15% gasohol.
Just my 2 cents.
|UPDATED|5/17/2014 4:24:03 AM (AZT)|/UPDATED|
|UPDATED|6/14/2014 5:57:46 AM (AZT)|/UPDATED|
1991 ZR-1 # 118 SW Headers/Corsa-3:73 gears-Haibeck-510HP/350 1993 ZR-1 # 179 Yellow/ White- Haibeck tune, Flowmasters 
$4 a gallon, I wish
. Here in the UK we pay (after converting £ to $) around $9 
, but I still rack up the mileage, guess we just love been scalped over here!|UPDATED|6/19/2014 5:55:05 AM (AZT)|/UPDATED|
The reason that I use premium is that I figure the computer will turn down the timing if I use lower octain,and make it less efficient .I might be wrong about this assumption though.
I also would like to ask any of you that have gotten rid of your catalitic convertors ,but have kept your factory manifolds if you notice any difference on mileage,or power .My car is basicaly stock with the execption of flowmasters,and de-screening,and opening the air box.
|UPDATED|6/19/2014 9:06:28 AM (AZT)|/UPDATED|