johnnydone Posted September 15, 2008 Report Share Posted September 15, 2008 26.5 avg hiway on regular holy cow hybrids move over here i come Link to comment Share on other sites More sharing options...
BodybyFisher Posted September 15, 2008 Report Share Posted September 15, 2008 26.5 avg hiway on regular holy cow hybrids move over here i come That is about what I am getting, hilly interstate highways tend to pull that down, I envy those of you in the Plain's states, Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
winterset Posted September 15, 2008 Report Share Posted September 15, 2008 I remember the best mileage I ever reported for my '96 Deville was a roadtrip from NY - Indiana in Nov 2000. me, wife & 2 tottlers total combined passenger weight ~300 lbs, and 50 lbs of luggage. no AC, of course cruise control, premium gas, 35 psi in the tires, and a very light foot ~60mph (I remember I wanted to proove the 29mpg hwy to be unattainable even under perfect conditions) I got 29.something or maybe better mpg. As I still do now, I was using Techron and Marvel Mystery oil in my gas, and I always used synthetic oil in the crankcase. Not sure what else that Techron does besides cleaning the Sulpher off the sending unit, but I am due for another bottle in both my GM cars. I have 8oz of MMO in each of the cars fueltank now. Link to comment Share on other sites More sharing options...
jock82 Posted September 16, 2008 Report Share Posted September 16, 2008 I remember the best mileage I ever reported for my '96 Deville was a roadtrip from NY - Indiana in Nov 2000. me, wife & 2 tottlers total combined passenger weight ~300 lbs, and 50 lbs of luggage. no AC, of course cruise control, premium gas, 35 psi in the tires, and a very light foot ~60mph (I remember I wanted to proove the 29mpg hwy to be unattainable even under perfect conditions) I got 29.something or maybe better mpg. As I still do now, I was using Techron and Marvel Mystery oil in my gas, and I always used synthetic oil in the crankcase. Not sure what else that Techron does besides cleaning the Sulpher off the sending unit, but I am due for another bottle in both my GM cars. I have 8oz of MMO in each of the cars fueltank now. Link to comment Share on other sites More sharing options...
jock82 Posted September 16, 2008 Report Share Posted September 16, 2008 26.5 avg hiway on regular holy cow hybrids move over here i come Link to comment Share on other sites More sharing options...
jock82 Posted September 16, 2008 Report Share Posted September 16, 2008 I have a 1994 Concours and I get 26-26 on the highway. However, I rented a 2008 STS from Avis for a Route 66 cruise this summer, sun roof, xm radio, dvd navagation, loaded, anyway, I know you probably won't believe this, I hardly believe it myself, but we go 34 miles to the gallon on the highway out of this car. Granted, I wasn't driving 75-80 most of the time. I got 30 miles to the gallon on a 2005 de ville, on trip to the Grand Canyon in 2005. Link to comment Share on other sites More sharing options...
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