70 mpg without a reference point can be high or low. 70 mpg for a TDI is considered high, but it still depends on the speed you're driving. An ALH TDI in a rabbit driving 40 mph on a flat road with no wind and pumped up tires will hit 100 mpg steady state for sure.
With the AHU (same engine but with a non VGT turbo, so more restrictive) in my mk3 jetta with winter tires at 55 psi, I was hitting 90 mpg steady state at 40 mph. The mk3 jetta is a lot heavier than an early rabbit and have a bigger frontal area. But I had a much better Cd though.
If it's a rabbit with a TDI transplant, I'd throw a propane kit in it. Anyone ever saw that video of a stock golf mk3 fitted with propane keeping up with a NSX in a drag race?
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