Quote:
Originally Posted by slowmover
Average MPH (odometer divided by run time) sure is handy way to “see” results. Irritating that the Hybrid Tahoe looks to make that difficult.
As a rule of thumb, anything under 26-mph means too much idle time. Conversely, get the average up into the 30’s and now one is on track.
One of the reasons I bought my pickup despite high miles was that the business owner averaged 47-mph. That means he pretty much didn’t stop except for diesel and cigarettes. It’s an exceptionally high average, one associated with full time highway travel. Fit his business.
Given that he was likely consistent and seeing 20-mpg (minimum; my average is 24+) the odometer miles translates then into gallons-consumed (another measure of life expectancy besides hours).
Comparisons to others are a start. Research. FUELLY. As living in Southern CA is fairly unique as to climate, look for others in area (with my TT I looked for same design, size & weight [a range], plus truck brand/spec/year, and then compared my rig against others in the South Central US where owners reported running same approx speed. Indeed, my truck averaged same as theirs. More than a dozen good comps.
Engine design life is: miles or hours or gallons. The second set against the first is the most reliable for a non-stationary vehicle.
Tire & brake wear are harder to quantify, though they are indicators. The AT2 is hurting economy. Not as bad as some tires, but money is being left on table. (Closed shoulder highest. A solid rib around outer edge).
As before, Scale it and match pressure to actual load (so long as that isn’t below GM door sticker range). Handling, braking, steering & life will benefit.
New shocks will distinctly help. BILSTEIN 4600. High COG vehicles REALLY suffer as they age. Any transition where the body and suspension are out of synch.
The average mph isn’t about travel speed so much as it is about LOWEST IDLE TIME. Ha! What’s THAT mean on a Hybrid? Second is maximizing steady state cruise.
How you, OP, can find a way to correlate one with another is the task, IMO.
Filling the fuel tank is not realistic feedback until an average of 3-5k miles is run. Really, a full calendar year to account for seasons and non-typical driving.
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1500rpm is idling for a AFM v4 at 65-70mph
that is why it falls to v4 mode at a stable speed 1500 rpm+-200rpm
I did the run today it peaked at 31.5 average MPG
and settled down to 25.6 (i'll fill it up tomorrow ) 5.6 gallons +-0.1 gallon
387 gallons is typical for 5,000 miles for the 5.3L engine 13MPG
I only used 209 gallons
saved 178 gallons of fuel
$ 747.42 saved on fuel over buying a non hybrid version
my old car would have used about 252 gallons
$180.55 saved (not to mention maintenance cost that was a real heavy hitter $1000-$2000)
my avg fuel cost over the last 3 months was $4.199 / gallon
the real question is why at v4 mode I can't get 75-80mpg I mean if it really was at 1500rpm in a v4 that would translate to 75-80MPG??
or is it because of a 3.0L displacement?
there is plenty of torque available(via the electrical motors)
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