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^^^ My thoughts exactly, Mech. I've been driving to keep the cat lit, and observing FE with engine-on P&G. The UG's cat temp display must be an estimate, based on its observed behavior. I started with a cold engine, with cat temperature starting <100F. Within 3 blocks, the cat was supposedly up to 900F. If I kill the engine, the cat temp displayed (900F, for example) doesn't drop. When I restart the engine, the cat temp display always starts recounting at ~100F, even when it was showing 1200F 30 seconds earlier. So, it's not very believable.
Since I didn't EOC on highway trips, I won't see any FE loss there. I just tanked up in preparation for such a trip. The UG indicated 43.2 mpg estimated, with the entire 215 mile tank driven engine-on. I always err on the conservative side, so every tank is at least as high as the UG estimate. Actual FE for the tank was 50 mpg! It was probably a short fill.
dcb, sorry I haven't gotten back to you. I've been busy the past 2 days, and won't have Internet again until Sunday night.
__________________
Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
Last edited by SentraSE-R; 02-03-2012 at 01:27 AM..
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